H12-261_V3.0 HCIE Routing & Switching Certification Questions

dumps2021-11-06T03:22:18+08:00

Want to pass HCIE Routing & Switching V3.0 Written exam easily? We provide the latest H12-261_V3.0 certification questions online. In real Huawei H12-261_V3.0 exam, there are 60 questions, and each candidate has 90 minutes to finish. The required passing score of HCIE Routing & Switching V3.0 H12-261_V3.0 exam is 600. Free Huawei HCIE R&S H12-261_V3.0 exam certification questions are available below.

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1. Which of the following about the description of VRRP fast switching is wrong? (Multiple Choice)

Use VRRP to monitor the BFD session or EFM function, after the BPD session or EFM session status changes, the VRRP module will be notified to realize VRRP fast connection switching

A VRRP backup group cannot monitor Peer BFD, Link BFD and Normal BFD at the same time

When multiple BFDs are configured to monitor at the same time, each configuration is related to each other, which may have an impact

Then the various configurations are related to each other, and may affect the VRRP backup group to monitor ordinary BFD, when the BFD status changes, the backup group priority will be changed to change the active and standby status

2. Under VXLAN, different VPN subnet need to access, wherein a subnet information follows, EVPN the RT10: 10both, RT1000: 100eport, VPN under RT100: 100. What is the configuration of another subnet? (Multiple choice)

Configure 1000:1000 bothevpn under VPN

Configure 1000 : 1000 both under EVPN

Configure 1000 : 1000 expot under EVPN

Configure 10 : 10both under VPN

3. Which is wrong about IPv6 Over VXLAN?

IPv6 over VXLAN means that Vxlan's Overlay network is an IPv6 network.

IPv6 over VXLAN can solve the problem of insufficient IP address resources for terminal tenants.

The tunnel between the Layer 2 and Layer 3 gateways of the VXLAN is an IPv4 network.

IPv6 Over VXLAN does not generate entries.

4. Which of the following statement about the digital certificate is wrong?

Digital signatures guarantee the integrity of digital certificates.

The digital certificate contains public key information.

When the received peer certificate is valid, but the device itself is in the wrong time and is not within the validity period of the certificate, the authentication fails.

Even if the two PRI entities are not in the same CA system, the two parties can complete the authentication as long as they can identify each other.

5. Router A has an IP router with a destination network segment of 10.0.0.1/32 and an outbound

interface of Gigabitethernet 0/0/1.

Now add the following configuration

acl number 2000

rule 10 permit source 10. 0.1.1 0

traffic classifier test

if-match acl 2000

traffic behavior test

remark dscp cs3

traffic policy test

classifier test behavior test

interface Gigabitethernet0/0/1

ip address10.0.12.1255.255.255.0

traffic-policy test outbound

Suppose Router A receives a packet with a destination IP of 10.0.0.1. The following statements which are

correct? (Multiple Choice)

If the source IP address of the packet is 10.0.0.1, it can be forwarded while the DSCP field remains unchanged.

If the source IP address of the packet is 10.0.0.1, it can be forwarded and the DSCP field is marked as CS3.

If the source IP address of the packet is 10.0.0.1, it cannot be forwarded.

If the source IP address of the packet is 10.0.0.1, it can be forwarded and the DSCP field is marked as cS3.

6. Which type of prefix will the router running BGP advertise to its own IBGP neighbor (assuming the router is not configured as a route reflector)?

The prefix is learned through the EBGP neighbor, or the prefix is learned from the R

The prefix is learned by other BGF neighbors, or the prefix is locally learned through network or route introduction.

The prefix is learned by other IBGP neighbors, or the prefix is learned from the EBGP neighbor, or the prefix is learned through the route introduction.

Presences existing in routing shows

The prefix is learned through the EBGP neighbor, or the prefix is learned locally through the network or route.

7. Which AS_PATH can the command ip as-path-filter1 permit^12*74$ match?

AS PATH (321122374)

AS PATH (1236217432374)

AS PATH (1253287423)

AS PATH (32127423)

8. ISIS protocol is in broadcast network and P2P network, when the router receives the LSP, it needs to

use PSNP to confirm and ensure the synchronization of the LSDB.

True

False

9. The topology map and configuration are as follows. Now I hope that there is no detailed routing entry

of 10.6.3.3/32 in the R1 routing table. Which of the following statements can achieve this requirement?

(Multiple Choice)

Configure route summarization on R3 and summarize the routes to 10.0.0.0/16.

Configure route summarization on R2 and summarize the routes to 10.0.0.0/16.

Configure filter-policy on R2, match ACL 10.0.3.3/32, and apply it in the expot direction.

Configure filter-policy on R1, match ACL 10.0.3.3/32, and apply it in the import direction.

10. In an MPLS VPN network, when a data packet enters the public and is forwarded, it will be encapsulated with two layers of MPLS labels. Which of the following options describes the processing procedure of the data packet correctly? (Multiple Choice)

The outer label of the packet received by the penultimate hop device is 3

The Egress PE device receives untagged IP packets

The Egress PE device correctly sends the data packet to the corresponding VPN according to the inner label

The packet is forwarded to the Egress PE device after the outer label pops up on the penultimate hop device

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11. Which version of the VRRP protocol is correct? (Multiple questions)

VRRPv2 is only applicable to IPv4

VRRPv3 does not support authentication

VRRPv2 supports authentication

VRRPv3 is only applicable to IPv6

12. The multicast IP address is 229.130.130.1, and its corresponding MAC address is __.

01-00-5E-12-82-01

01-00-5E-82-82-01

00-00-5E-02-82-01

00-00-5E-82-82-01

13. When DLDP detects that a unidirectional link exists in the optical fiber, the default operations of the Huawei device include: DLDP state machine migrates to the Disable state, outputs trap information, automatically sets the interface to the blocked state.

True

False

14. A router is configured for OSPF and is connected to two areas: area 0 and area 1. You configure

area 1 as a stub area. Which LSA types will exist inside area 1?

Type 7

Type 1 and 2

Type 1, 2, and 5

Type 3 and 4

Type 1, 2, and 3

15. The routing policy tools that BGP can use mainly include Filter-policy and Route-policy. Filter-policy can only filter routes, and Route-policy can only modify routes.

TRUE

FALSE

16. The interface Serial0 of an existing router is in OSPF area 1, and the interface Serial0 is set to the

Silent interface, so what effect does this setting have?

OSPF does not establish any adjacencies through the interface.

OSPF does not add routes learned from the interface to the local routing table.

OSPF will receive routing updates from neighbors

OSPF establishes available adjacencies through this interface.

17. Which of the following statements about VLAN aggregation are correct? (Multiple questions)

Sub-VLAN is used to isolate the broadcast domain

A Super VLAN can contain one or more Sub-VLANs

Super Sub-VLAN contains physical interfaces, which can establish a three-layer VLANIF interface

Sub-VLAN contains physical interfaces, and can establish a three-layer VLANIF interface

18. Huawei's two switches, SWA and SWB, are connected through seven Ethernet ports and are

configured with static link aggregation. The corresponding ports on the switch SW are Ethernet 1/0/2,

Ethernet 1/0/3, Ethernet 1/0/4, and Ethernet 1/0/5, Ethernet 1/0/6, and Ethernet 1/0/7. The configuration

mode is configured in the order of the ports. If the switch SWA and SWB support only 6 ports in each

aggregation group.

Ethernet1/0/7 Unselected port with consistent port configuration

Ethernet1/0/6 Unselected port with consistent port configuration

In the case that the configurations of the ports are the same, the SWA randomly selects one of the seven ports as the aggregation group Unselected port.

Ethernet1/0/1 Unselected port when the configurations of the ports are the same

19. If the host HW1 in the HW device network wants to join a video conference, what does the host do?

Send IGMPv2 membership report unicast to the default router on the local network.

Send a unicast IGMPv2 membership report to the RP

Sending an IGMPv2 membership report through multicast on the local network, and the multicast address carried in the IGMPv2 membership report is the joined multicast address.

Send the IGMPv2 membership report through multicast on the local network. The destination multicast address sent by the IGMPv2 membership report is "all PIM routers" 224.0.0.2 multicast address.

20. Regarding the multicast ASM model and the SSM model, which of the following statements are correct? (Multiple choice)

SSM and ASM use the same multicast address range

In the SSM model, the receiver already knows the specific location of the multicast source in advance through other means

In the ASM model, the receiver cannot know the location of the multicast source in advance

SSM directly establishes a multicast forwarding tree between the recipient and the multicast source

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21. When configuring AS-Path-Filter, ip as-path-filter 10 permit_100$ means to match the route received from A5100 but not originating from AS100.

TURE

FALSE

22. Which of the following description of the MUX VLAN in the Huawei switch is correct?

In the same VLAN, the MUX VLAN can be mixed with the Super VLAN to use.

The MUX VLAN is divided into a Principal VLAN and a Subordinate VLA

The Subordinate VLAN is further divided into a Separate VLAN and an Isolate VLA

Each Separate VLAN can be bound to multiple Principal VLANs

Principal Port can communicate with all interfaces in the MUX VLAN

23. The topology of a multi-protocol network is shown in the figure. Please study the topology carefully. The router (in Area1) imports the routes learned through BGP into the OSPF process. Then, what types of LSAs will R3 generate to advertise to area 0?

Type 5 LSA

Type 7 LSA

Type 1 LSA

Type 4 LSA

Class 2 LAS

24. If running PIM-SM on a multicast network, you need to construct a multicast forwarding tree between the multicast source and the receiver to enable the receiver to receive multicast data. Which of the following description about the constructed multicast forwarding tree is correct? (Multiple Choice)

The RTP tree is built between the RP and the receiver.

The RPT tree is built between the multicast source and the R

The SPT tree is built between the RP and the receiver.

The SPT tree is built between the multicast source and the R

25. Which of the following operations can implement fast fault detection on multicast network? (Multiple choice)

Shorten the Holdtime of Join/Prune messages

Reduce the interval at which the interface sends Hello messages.

Establishing PIM BFD session between neighbors

Reduce the interval for sending Join/Prune messages.

26. The following procedure for NDP to resolve the link layer address is correct or not.

True

False

27. ping -a X -c Y -s Z -vpn-instance M 10.5.2, what is the meaning of this command? (Multiple choice)

The ICMP request of the ping, the packet size is Z (excluding IP and ICMP header)

The source IP address of the ping packet is X

The ping packet belongs to VPN instance M

The ping sends Y ICMP requests

28. As shown in the figure, an engineer uses 4 routers to conduct branch network interoperability tests. Among them, R1, R2, and R3 in branch 1 deploy OSPF to achieve network interoperability, and R2, R3, and R4 in branch 2 deploy IS-IS to achieve network interoperability.

Now the engineer wants to implement R1 to access the loopback address of R4. Which of the following operations can meet this requirement?

No configuration is required

Advertise the default route only in the OSPF process of R2

In the OSPF process of R2 and the IS-IS process, respectively advertise the default route

Advertise the default route only in the IS-IS process of R2

29. If the PPP link between R1 and R2 is shown, and the direct connection port is not on the same

network segment, but the R1 and R2 direct connection ports can communicate, and the Ethernet link

cannot communicate under the same IP planning, what is the reason? (Multiple choice)

R1 and R2 are connected to the POS port, and the 24-bit subnet route of the direct connection port of the other party is learned through IPC

R1 and R2 are connected to the POS port, and the 32-bit host route of the direct connection port of the other party is learned through IPC

The interconnected POS port of R1 and R2 learns the MAC address of the peer interface through LCP, and does not require the ARP request MAC address.

The data packets of the interconnected POS interface of R1 and R2 do not need to encapsulate the Ethernet header, and do not need to use ARP to request the MAC address.

30. What are the differences between traffic policing and traffic shaping? (Multiple Choice)

For traffic shaping, the router will buffer excess packets until the bandwidth is available again.

For traffic policing, you can adjust the usage of the cache for traffic exceeding CI

For traffic shaping, you can adjust the usage of the buffer for traffic exceeding CI

Apply traffic shaping in the direction of the entrance and use traffic policing in the direction of the exit.

Traffic policing uses the token bucket algorithm, and traffic shaping uses the SPD algorithm.

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31. What are the benefits of OSPF area division? (Multiple choice)

It can reduce the size of LSDB and thus reduce the consumption of router memory

LSA can also be reduced with the division of areas, reducing the consumption of router CPU

A large number of LSA flooding is restricted to a single area

Routers in an area can understand the topology details outside their area

32. Which of the following descriptions about the FTP protocol is correct?

In the FTP Passive mode, the client completes the initialization of the TCP session for control and data.

In FTP Active mode, the server uses the command "PORT" to tell the client which port it expects to send data.

FTP always uses a TCP session to transmit control information and data information.

FTP always uses TCP port 20 to establish a data session, using ICP port 21 to establish control Session

FTP always uses TCP port 21 to establish a data session and TCP port 20 to establish a control session.

33. What is the main reason why RSTP converges faster than STP?

RSTP increases the type of port status

RSTP has less overhead

RSTP is not based on timer convergence

RSTP has a smaller timer

34. Which of the following description about interfaces on the switch Access procedure receives data frame mode is correct?

In Access mode, when a tagged data frame is received, it is directly discarded.

In Access mode, the VLAN tag of the data frame will be stripped when sending.

In Access mode, only data without marking is received.

When the data frame enters the handshaker interface, the switch will learn the destination MAC address in the data frame.

35. About the description of MPLS lable related information, which of the following is wrong?

The length of the MPLS label is 4 bytes and it is encapsulated between the link layer and the network layer.

By default, the device supports the PHP feature, and the label value of the egress node supporting PHP which is allocated to the penultimate hop node is 3.

If the bottom mark of the label is S=0, it indicates that the label is the bottom label and directly performs IP forwarding.

When the tag value is 0, it indicates that the tag should be ejected, and the packet must be forwarded based on IPv4.

36. Which of the following description about configuring BGP4+ is correct? (Multiple choice)

The BGP4+ router-ID is the same as the BGP4 router-I

BGP4+ must use the Link-Local address when specifying the peer

The next hop of the BGP4+ route does not use the Link-Local address.

When BGP4+ configures a reflector, the roles of the reflector and the client must be consistent with the configuration of BGP4.

BGP4+ does not support route reflectors.

37. The LAND attack is performed by the attacker sending a source address and a destination address to the destination host are the destination host, the same SYN packet on source port and the destination port. When the receiver waits for the final ACK packet from the sender, the connection is always in a semi-connected state, resulting in waste of limited TCP resources at the receiving end.

True

False

38. Four routers R1, R2, R3, and R4 run ISIS, the ISIS router type is marked, and the routing table is

viewed on R1. The reason why R1 does not reach the route of 10.34.34.4 is

Configure a routing policy on R2 to filter the default route.

R2's system-ID conflicts with R3

Regional planning errors for R3 and R4

R2's system-ID conflicts with R1

39. Which of the following parameters are modified, and then the IS-IS neighbor relationship needs to be re-established? (Multiple choice)

Modify the cost value of the IS-IS interface

Modify the IH transmission interval of the IS-IS interface

Modify the level of the IS-IS interface

Modify the IP address of the IS-IS interface

40. In the LDP session establishment process, the active party will first send Initialization information to negotiate parameters. If the passive party does not accept the negotiation parameters, which of the following messages will be sent?

Error Notification Message

Hello Message

Initialization Message

Keepalive Message

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41. You expect to deploy multicast video applications on your private, internal network. In order to achieve this goal, you need to use private multicast IP addresses in your network. So which range of IP addresses can be used?

239.0.0.0-239.255.255.255

241.0.0.0-241.255.255.255

224.0.0.0-224.255.255.255

240.0.0.0-240.255.255.255

226.0.0.0-226.255.255.255

42. The RSTP protocol provides a variety of protection functions. For example, when the edge port is configured in the protection state, the processing method after the edge port receives the BPDU message is:

Discard the BPDU message directly

Close the port

Obtain relevant information after parsing the BPDU message

Forward BPDU packets as required

43. Which of the following description is wrong about the MPLS BGP VPN?

IBGP establishes a stable BGP neighbor relationship for the ARPback interface address.

Route switching between PE and CE can be static route, OSPF multi-instance, IS-iS multi-instance, EBG

The TTL field in the tag has the effect of preventing loops.

BGP Soo is used to prevent routes routed from a VPN site from going back to the site through the MPLS backbone. Soo is an extended community attribute automatically generated by MP-BG

44. Which of the following statements about MUX VLAN are correct? (Multiple choice)

Principal VLAN can communicate with all VLANs in MUX VLAN

Each Separate VLAN must be bound to a Principal VLAN

Separate VIAN can communicate with all VLANs in MUXVLAN

Each Group VLAN must be bound to a Principal VLAN

45. If the default route is not used in the local IP routing table, the default route-import command is used

to advertise the default route to the BGP peer (group).

True

False

46. What is the meaning of ipv6 enable topology ipv6 in IS-IS protocol view?

Doesn't have any meaning

Does not support IPv6 SPF calculation

SPF calculation is performed separately in the topology of IPv4 and IPv6

IPv4 and IPv6 use the same topology for SPF calculation

47. The basic header length of an IPv6 message is a fixed value.

TURE

FALSE

48. About the description of CHAP authentication function in the PPP protocol, which of the following are correct? (Multiple Choice)

If the authenticator does not have a username, the password cannot be configured on the authenticated interface.

Calculate a hash value using the authentication sequence ID, random number, and key by the MD5 algorithm

Three-message interactive authentication is required, and the username is transmitted only on the network without transmitting the password.

The user name must be configured under the authenticated interface of CHAP authentication.

49. Which of the following categories can ACL be divided into?

Advanced ACL

Layer 2 ACL

User-defined ACL

Basic ACL

50. Which of the following is wrong about HTTPS?

HTTPS protocol uses TCP port 443 by default.

HTTPS secures access to data by using SSL VP

When using HTTPS to access a website, if the user's browser does not recognize the digital certificate of the website, the website cannot be accessed.

If the HTTPS traffic contains a virus, the router cannot directly detect the virus using IPS technology.

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51. BGP can only auto-aggregate routes whose source is Incomplete.

True

False

52. Which of the following statements about the format of OSPFv3 packets are correct? (Multiple choice)

There is no change in the option field of the Hello message

Hello message no longer contains address information, but carries Interface ID

Removed Authentication and AuthType fields

OSPF version number changed from 2 to 3

53. You are doing a job to compress the length of an IPv6 address as much as possible. The existing IPv6 address is 2013:X000:130F:0000:0000:09C0:876A:130B, In order to make the IPV6 address more concise, the IPv6 address can be compressed into which of the following one?

2013:0:130F:0:09C0:876A:130B

2013:130F::9C0:876A:130B

20130130F:0:0:9C0:876A:130B

213::13F::9C:876A:13B

2013:0:130F::9C0:876A:130B

54. HW users are transmitting a lot of files through TFTP.

What protocol does TFTP rely on for transmission?

IcmP and UDP

iP and TCP

UDP

NFS

FTP

55. An engineer uses two routers to test IPv6 services, and simulates the interconnection between headquarters and branches by running BGP4+.

The logical topology of the network is shown in the figure. Regarding the transmission of IPv6 routes between two devices, which of the following statements is wrong?

When routing is transmitted, it will carry recognized mandatory attributes such as AS_Path

BGP4+ transmits routing information between peers through Update packets

When routing, the Next_Hop attribute must be an IPv6 global unicast address

If the Update message carries the MP_REACH_NLRI attribute, it means that the advertised route is reachable

56. 1.Which of the following advanced features does BGP EVPN support?

ARP broadcast suppression

VRRP over VXLAN

Multi-live gateway

VXLAN Qos

57. ISIS will elect DIS in the broadcast multi-access network. Which of the following statement about DIS is correct? (Multiple Choice)

ISIS elects the DIS by comparing the priorities and compares the MAC addresses if the priorities are the same.

DIS guarantees database synchronization by periodically sending CSNP messages

In a broadcast multi-access network, the DIS sends Hello PDUs three times as often.

DIS supports the preemption function. After the new DIS preemption is successful, you do not need to flood any LSP packets.

58. In the process of using the LACP protocol, which of the following description is correct? (Multiple choice)

You can prevent the Eth-Trunk interface from frequently flapping due to physical link reasons. Interface eth-trunk 1 Lacp preempt enable Lacp preempt delay delay-time

You can configure the source IP address for load balancing in the enabled link aggregation group by using the following command: Interface eth-trunk 1 Load-balance src-dst-ip

You can remove a member interface in an enabled link aggregation group by using the following command: Interface Gigabitethemnet0/0/0 Debug Interface Gigabitethernet0/0/1 Undo eth-trunk 1 Interface Gigabitetheret0/0/ Undo shutdown

You can add member interfaces to the link aggregation group enabled by the following command: Interface Gigabitethernet0/0/1 Debug Interface Gigabitethernet0/0/1 Trunkport Gigabitethernet0/0/ Interface Gigabitethernet0/0/1 Undo shutdown

59. Regarding the BGP anti-ring mechanism, which of the following description is correct? (Multiple

Choice)

Use the AS_PATH attribute between autonomous systems to prevent loops.

The Cluster List attribute is used for the anti-ring in the reflector cluster. If the router discovers that the cluster list of the route entry contains its own cluster ID, it will reject the route.

Routes learned from IBGP are not advertised to IBGP neighbors to prevent routing loops within the A

You can use the AS_CONFED_SET attribute to prevent loops within the federation.

60. IPv6 introduces Solicited-Node address, which of the following description about the address is correct?

This is a specific address, which is used to resolve MAC addresses in ARPV6.

The Solicited-Node address on the router interface is automatically generated, and there can be multiple.

If the Solicited-Node address is not configured , the router will automatically generate one on each interface.

IPv6 introduces Solicited-Node address to support IPV6 multicast.

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61. As shown in the following figure, the corresponding peer relationship is established. The AS400

receives the 1.1.1.1/32 network route from the AS100. What is the AS-Path attribute?

100, 200, 300

400, 300, 200, 100

100, 200, 300, 400

300, 200, 100

62. If the Sticky MAC function of the interface is enabled, what is the number of MAC addresses learned by the interface by default?

63. As shown in the figure, which of the following statement is correct? (Multiple Choice)

If the R2 Ethernet 0/0/1 interface is down, the R1 BFD session can quickly detect the fault and notify R1 to make the OSPF neighbor relationship down.

The OSPF status changes to FULL, which triggers the BFD session.

If the R2 Ethernet0/0/0 interface is down, the next hop of the route that R1 reaches 10.0.0.2 is changed to 10.0.21.2.

If the BFD function is disabled on R2, the BFD session on R1 will be down. This will result in the ospf neighbor relationship down.

If the R2 Ethernet 0/0/1 interface is down, the next hop of the route that R1 reaches 10.0.0.2 is changed to 10.0.12.2.

64. In MPLS VPN, in order to distinguish IPv4 prefixes that use the same address space, the RD value is added to the IPv4 address. Which of the following description is correct? (Multiple Choice)

After the PE receives the IPv4 route from the CE, it adds RD to the IPv4 route and converts it into a globally unique VPN-IPv4 route, and publishes it on the public network

RD can be used to control the release of VPN routing information

On the PE device, each VPN instance corresponds to an RD value. On the same PE device, the RD value must be unique in the Update message

DRD is encapsulated as an extended community attribute of BGP in the transmission process

65. In route-policy, what are the BGP attributes that can be used in the apply clause? (Multiple Choice)

AS-Path

MED

Local-Preference

Tag

66. Which of the following statements about VXLAN is wrong?

Introducing VXLAN technology into the campus network can realize Layer 2 and Layer 3 communication

VXLAN uses MAC in UDP encapsulation to extend the Layer 2 network, encapsulating Ethernet packets on top of IP packets

VXLAN packets are forwarded by routing in the Underlay network, and the Underlay does not pay attention to the terminal MAC address of the inner data frame when forwarding

When deploying VXLAN, in addition to the devices at both ends of the VXLAN tunnel that need to support VXLAN, the forwarding device in the middle must also support it, otherwise VXLAN packets cannot be forwarded normally

67. About Filter-policy, which of the following description is correct?

Filtering the generation of type 5 LSAs and type 7 LSAs on the ASBR in OSPF using Filter-Policy

The prefix list can filter routes as well as filter packets.

Filter-Policy can filter the received or advertised link state information and can modify the attributes of the route entry.

When filtering routes using the prefix list, the entry ip ip-prefix 1 deny 0.0.0.0 0 less-equal 32 means that only the default route is matched.

68. When deploying BGP/MPLS IP VPN, when two VPNs have a common site, the common site must not use overlapping address spaces with other sites of the two VPNs.

TRUE

FALSE

69. In the lab network, the network is built as follows. SW1 is the default configuration and SW2 disables STP. Which of the following description about scenario is correct?

G0/0/2 of sw1 enters Discarding state

G0/0/1 of sw2 enters Discarding state

G0/0/2 of sw2 enters Discarding state

No interface is blocked

G0/0/1 of SW1 enters Discarding state

70. Router R1 and Router R2 run BGP. Both routers are in the AS 65234. The route of router R2 exists in

the BGP routing table of router R1, but is not in the IP routing table of router R1. So, what caused the

problem?

Synchronization is turned off

The BGP neighbor relationship is Down.

Router R1 does not enable BGP Multi-hop

Routing is not optimal

Page 8 of 15

71. Regarding the OSPFv3 protocol, which of the following description is wrong?

When sharing a router, each OSPFv3 process runs independently.

Multiple instances can be run in the same OSPFv3 process on the same interface.

Support multiple instances running on a single link

The Instance ID field is included in the OSPFv3 packet header.

72. In the packet forwarding of the cross-domain VPN-Option B mode, the two ASBRs will exchange the

LSP labels of the public network once.

True

False

73. When the payload is an ICMPv6 packet, if the extended header is not considered, what is the value of the Next Header field in the IPv6 header?

74. Combined with the output of the following figure, which of the following judgment is correct? (Multiple

choice)

R3 must be a DIS of a level-1 link

R3 router is a level-2 router

R3 must be a DIS of a level-2 link

The system ID of the R3 router is 0003.0000.0000

75. BGP routing policy can control the distribution and reception of routes.

TURE

FALSE

76. Generally, VPN users can only communicate with each other, not communicate with Internet users, cannot access the Internet. But VPR respective site may have access to the need of Internet. Which of the following description about VPN and Internet implementations is correct? (Multiple choice)

Implemented on the user side, directly connect the CE to the Internet. Each user site can be individually connected to the Internet. That is, the CE of each site is configured to the default route of the Internet.

In the PE, realization is complex, and there are security risks, PE equipment may be subject to Internet of Dos political strike.

Implemented on P

The PE device sends a default route to the Internet to the CE, and adds a default route to the VPN instance routing table to point to the Internet gateway.

It is implemented on the user side, the implementation method is simple, the public network and the private network route are isolated, and it is safe and reliable.

77. Which of the following types of packets is required to implement virtual machine migration in the BGP EVPN distributed gateway scenario?

Type3

Type5

Type4

Type2

Type1

78. Configure queue-based traffic shaping. If the queue length exceeds the cache size, the tail is

discarded by default.

True

False

79. If the router only needs to forward IPv6 packets, there is no need to configure any IPv4 protocols and addresses on the router.

Ture

False

80. Assume that the BGP/MPLS IPv4 VPN, OSPF, LDP and Static routing are configured on the PE. Which of the following protocols are required to configure to enable the GR to obtain NSF function? (Multiple Choice)

OSPF

MPLS LDP

BGP

Static routing

Page 9 of 15

81. A number of transition techniques have emerged in the process of replacing a P4 address used in a

network with a Pv6 address. These technologies are divided into two categories, one is PV4/IPv6

coexistence technology and the other is v4/P6 interworking technology. Which of the following options

belong to Pv4/IP6 coexistence technology? (Multiple Choice)

NAT64

IPv6 over IPv4

Dual-Stack

ISATAP

82. What is wrong about the description of RP in PIM-SM?

All members of the group and multicast sources sending multicast data to the group converge to a unique RP

The initial multicast stream of all groups in the shared tree is forwarded to the receiver through the RP

One RP can serve multiple multicast groups at the same time, and one multicast group can correspond to multiple RPs

RP can be responsible for the forwarding of several or all multicast groups, and there can be one RP in the network

83. Which of the following configuration of OSPFv3 route aggregation is correct?

[Huawei] ospfv3 1 [Huawei-ospfv3-1] area 1 [Huawei-ospfv3-1-area-0.0.0.1] abr- summary fc00: 0: 0:: 48 cost 400

[Huawei] interface gigabitethernet 1/0/0 [Huawei-GigabitEthernet1/0/0] asbr-surmary fc00: 0: 0: : 48 cost 20

[Huawei]ospfv3 1 [Huawei-ospfv3-1] asbr-surmary fc00: 0: 0: : 48 3 cost 20 tag 100

[Huawei]ospfv3 1 [Huawei-ospfv3-1] abr-surmary fc00: 0: 0: : 48 cost 400

[Huaweilospfv3 1 [Huawei-ospfv3-1] area 1 [Huawei-ospfv3-1-area-0.0.0.1] asbr- sumary£c00: 0: 0: : 48 cost 20 tag 100

84. BGP 4+ runs between the two routers. The neighbor relationship is normal. However, the BGP routing table of the local router does not have neighbor's routing entry. What is the possible reason? (Multiple Choice)

The routing entries of the peer BGP routing table are non-optimal.

The next hop address of the BGP routing entry is unreachable.

Peer ignore configured on the peer

Active-route-advertise configured on the peer

85. Which of the following statements about IS-IS (IPv6) are correct? (Multiple questions)

To support the processing and calculation of IPv6 routing, IS-IS has added TLV 232, 236

By default, IS-IS enables the multi-topology feature

IS-IS works at the data link layer and only needs to add a new TLV to support IPv6

In order to support the processing and calculation of IPv6 routing, IS-IS added NLPID in 129TLV

86. An existing switch runs the RSTP protocol. If the network topology changes, what will happen to the Layer 2 forwarding entries automatically learned by the switch?

All entries are deleted

Except for the entries related to the edge ports that are not deleted, all other entries are deleted

Only entries related to the port that received the TC message will be deleted

If the aging time is set to 15 seconds. Then the items that have exceeded the aging time will be deleted

Except for the entries related to the edge port and the entry related to the port receiving the TC message are not deleted, all other entries are deleted

87. Which of the following descriptions of MED is correct? (Multiple questions)

The default value of MED is 100

MED can only be delivered within this AS

MED is an optional non-transitional attribute

The default value of MED is 0

88. During the evolution from IPv4 network to IPv6, some transition technologies have emerged. Which of the following are common types of transition technologies? (Multiple questions)

Dual stack technology

Tunnel technology

Compatible technology

Conversion technology

89. A total of 6 bits indicating the priority field in the VLAN (802.1Q) data encapsulation

True

False

90. Regarding BGP MED, which of the following descriptions are correct? (Multiple questions)

In BGP routing rules, the priority of MED is lower than AS Path, Praferred-Value, Local-Preference and Origin

The default value of BGP route MED is 0

By default, if there is no MED value in the route attribute, it will be treated as 0. If the bestroute med-none-as-maximum command is configured, the MED will be processed as the maximum value of 4294967295

By default, BGP routing rules can compare the MED of routes from different autonomous systems

Page 10 of 15

91. Which of the following description of BGP neighbors are wrong? (Multiple questions)

BGP router supports automatic neighbor discovery

MD5 authentication must be configured for BGP to establish neighbors

BGP needs to establish a UDP connection before establishing neighbors

BGP needs to exchange link state information to establish neighbor relationships

92. Which of the following options is correct for the assertion mechanism?

The size of the IP address will not be used as a condition for election during the election of the winner.

In the assertion mechanism, winner is responsible for forwarding multicast data to the broadcast network segment.

The assertion mechanism is used for the election of the D

In the assertion mechanism, loser shut down the interface connected to the broadcast network.

93. If an announcement route entry is deleted on a BGP route, it will trigger the BGP router to send a Update message of route revocation, which carries the recognized mandatory attributes of the revoked route entry.

True

False

94. What is LSA for the flooding scope of the entire autonomous system in the OSPFv3?

Intra-Area-Pre fir-LSA

AS-external-LSA

Inter Area-Prefix-LSA

Link-LSA

95. Regarding BGP recognized arbitrary attributes, which of the following descriptions are correct? (Multiple choice)

Must be transmitted between BGP neighbors

All BGP routers must be identified

It is not required to be in the Update message, and it can be decided whether to add to the Update message according to the specific situation

BGP router may not recognize

96. Which of the following series can be matched by the regular expression [^100 | 200]$? (Multiple choice)

300 200 100

200 100 300

100 200 300

100 300 200

97. As shown in the following picture, which of the following description is correct?

R1 exist LSDB of Level-1 and Level-2 at the same time

R1 may Ping through R21 1oopbapk0 interface address

R1 has a route to R2 1oopback0 10.0.2.2/32

No neighbor relationship can be established between R1 and R2.

98. As shown in the figure, the IPSEC VPN is established between the branch and the headquarters

using redundant links. At the same time, URPF is enabled on the traffic from the branch 1 on Router B.

Which of the following options is correct? (Multiple Choice)

When using IPSEC backup link redundancy backup, URPF loose mode is recommended when the URPF function enables on the physical interface.

When using IPSEC multi-link redundancy backup, URPF strict mode can be used when URPF function enables on the tunnel interface.

When using IPSEC backup link redundancy backup, URPF strict mode can be used when URPF function enables on the physical interface.

When using IPSEC multi-link redundancy backup, URPF strict mode can be used when URPF function enables on the physical interface.

99. In an MPLS domain, LSRs can be divided into Ingress LSR, Transit LSR, and Egress LSR according to the way of LSR processing data. For the same FEC. A certain LSR may also be the Ingress LSR of the FEC or the transit LSR of the FEC.

TRUE

FALSE

100. egarding MP-BGP, which is wrong in the following description?

MP-BGP needs to assign private network labels to VPNv4 routes

When the PE and CE exchange routes through BGP, you need to create a BGP process for each VPN instance on the CE

MP-BGP's message type and VPNv4 route advertisement policy are the same as BGP-4

MP-BGP advertises VPNv4 routes through two attributes: MP_REACH_NLRI and MP_UNREACH_NLRI

Page 11 of 15

101. When BGP EVPN Type2 routing is used to transmit IRB type routing, what does the information carried include? (Multiple choice)

Host IP address

Host MAC address

Layer 2 VNI

Three-tier VNI

102. Which of the following statements about URPF, IPSG and DAI are wrong? (Multiple Choice)

DAI does not support manual configuration of the binding table.

IPSG checks the source IP address and MAC address of the IP message. DAI only checks the correspondence between IP and MA

URPF can be used to prevent DDoS false source attacks.

IPSG technology checks IP packets to prevent source IP spoofing attacks, while DAI checks ARP packets to filter the attack source

103. What message will be sent to the Agent when running NMS (Network Management Station) of SNMPV1?

Trap, Get and Set

Get, Set and Getnext

Get, Set, Getnext and GetBulk

Get, Set and GetBulk

Trap only

104. When judging LSA is old or new, will use the serial number of the reference models and age parameters, which the following statements about the two parameters are correct? (Multiple choice)

When the router receives two LSAs with the same sequence number and the same checksum, the smaller the age, the better

When the router receives an LSA, the age is set to 3600S, indicating that this LSA is unavailable

If the sequence number of the LSA reaches the end value Ox7FFFFFFF, the current router advertises the LSA whose age is 3600S

Both the serial number and age parameters can determine the old and new LSA, the router will give priority to the sequence to participate in the teaching, the larger the better

105. Which types of messages are supported by the BGP protocol? (Multiple Choice)

Open

Keepalive

Update

Hello

106. The E position is 0.

B. The NSSA area generates seven types of LSAs to advertise external routes. The FA address in the

seven types of LSAs is used to prevent loops.

C. A default LSA must be automatically generated in the NSSA area to access the external network.

D. The OSPF neighbor in the NSSA area sends the he1lo text. The N position in the option- field is 0, and

the E position is 1.

107. Which of the following description is wrong about sham link?

The endpoint address of the Sham link is advertised by BGP as the VPNv4 address. Routes that have passed through the sham link can also be imported into BGP in the form of VPNv4 routes

Sham link can be configured in any area and needs to be configured manually, and there must be a route to the sham link destination address (the sham link endpoint address of the peer PE) in the local VPN instance

Sham link is regarded as a link between two VPN instances. Each VPN instance must have an endpoint address of the sham link, which must be a Loopback with a 32bit mask in the VPN address space on the PE router. interface address

In order to forward VPN traffic through the MPLS backbone network, the route cost of the sham link should be less than the OSPF route cost of the backdoor link

108. When DLDP detects a unidirectional link on an interface, the default operations on Huawei devices

include: DLDP switches to the interface to Disable state, generates a trap and sets the interface state to

DLDP Down.

TRUE

FALSE

109. You hope that only telnet traffic can access the server (the address is 10.1.1.100).

Then, you added the following ACL on the router:

rule 5 permit tcp source any destination 10.1.1.100 0.0.0.0 destination-port eq 23 rule 10 deny ip source any destination any

Then you apply the ACL to the ingress direction of the serial interface of the router. Which of the following types of packets will be allowed to pass through the router?

A non-fragmented message that uses port 21 to access the server

Messages that are not the first fragment and use port 23 to access the server's message server

Non-first fragments to access packets from other hosts

Packets that are not the first fragment and use port 21 to access the server

The first fragmented or non-fragmented packet that uses port 23 to access the server

110. Which of the following statements are correct about PPPoE data frames? (Multiple Choice)

The fixed value of the Ethernet Type field is Ox8863.

The Session_ID segment of the ppp session must be the value specified in the Discovery phase and cannot be changed.

When PPPoE is used to transfer session data, Code must be set to 0x0.

After the PPPoE session is established, all Ethernet packets are unicast.

Page 12 of 15

111. Regarding Multi-VPN-Instance CE (MCE), which one of the following descriptions is wrong?

Devices with MCE function can access multiple VPN instances in BGP/MPLS IP VPN applications, reducing user investment in network equipment

There must be multiple physical links between MCE and PE to achieve isolation between different VPN instances

Users connected to the same MCE but not belonging to a VPN instance cannot access each other

On the MCE device, you need to create separate routing and forwarding tables for different VPNs, and bind them to the corresponding interfaces

112. Which of the following are the techniques for improving MPLS BGP VPN reliability? (Multiple Choice)

VPN GR

VPN FRR

Configure CE dual-homing networking at the access layer.

Private network IP routing between the PE and the CE FRR

113. Which of the following description about the related information of BGP4+ is correct? (Multiple

choice)

Bgp4+ can use the dampening command to suppress IBGP routes.

Modifying the Router ID of the BCP will cause the BGP connection between the routers to be re-established.

The Next Hop attribute in BCP4+ is represented by the Pv6 address, which can be the link-local address of the next hop.

BGP4+ does not support automatic route aggregation.

114. The DHCPv6 server supports to provid the host with other configuration information such as the DNS server address.

TURE

FALSE

115. When configuring source NAT with no-pat configuration parameters, which of the following statements is correct?

Only the destination IP address translation session and dynamic BFD session

Perform destination IP address and destination port conversion

Simultaneous conversion of source IP address and source port

Only source IP address translation

116. In the intra-domain MPLS VPN network, when a data packet enters the public network and is forwarded, it will be encapsulated with two layers of MPLS labels. Which is wrong description of the two layers of labels in the following options? (Multiple Choice)

The outer label of MPLS VPN is allocated by LDP protocol or statically, and the inner label is allocated by the MP-BGP neighbor of the opposite end.

The outer label of MPLS VPN is called the private network label, and the inner label is called the public network label.

The outer label is used to correctly send the data packet to the corresponding VPN on the PE device

By default, the outer label is ejected before the packet is forwarded to the last-hop device

117. When deploying LLQ, you need to configure bandwidth parameters. What is the meaning of bandwidth parameters?

Provide a built-in policer to limit the maximum available bandwidth of low latency queues during congestion

This parameter should be as small as possible. It means that the bandwidth is always reserved, even if LLQ is used, this parameter will reduce the available bandwidth of the interface.

It indicates that the reference CR is used to calculate the burst size of the built-in policer token bucket.

This parameter is an option because LLQ always takes precedence over other queues

118. You need to configure policy routing on the router to specify that specific traffic is forwarded through

an interface.

When using policy-based routing, which two types of most typical information can be used to forward

traffic along a particular path?

TTL and source IP address of the packet

Source IP address and Layer 2 source address

Source IP address and specific protocols (such as FTP, HTTP, etc.)

Service type header and message length

119. Which of the following statements are true about IPSec VPN? (Multiple Choice)

Savage mode can support NAT traversal, while main mode does not support NAT traversal

Two routers establish IPSec VPN through the main mode. Starting from the fifth packet (including), the payload data is often encrypted.

Two routers establish IPSec VPN through aggressive mode, then only two packets are exchanged between the two devices to establish a tunnel.

Two routers can establish OSPF neighbor relationships through IPSec VPN tunnels and exchange intranet routes.

120. Command ip ip-prefix ip-prefix-name [index indexnumber{permit|deny}ipv4-address mask-length if a prefix list of less-equst has been specified, but greater-equal is not specified, then what is the scope of the prefix?

[0 ， less-equal-value]

[mask-lenath ， less-equal-value]

[ess-equal-value ， 32]

No limit

Page 13 of 15

121. One BD in VXLAN can correspond to multiple VNIs.

True

False

122. What is the correct statement about the difference between OSPFv2 and OSPFv3? (Multiple Choice)

Both OSPFv2 and OSPFv3 support interface authentication, and OSPFv3 authentication is still implemented based on the fields in the OSPF message header

OSPFv3 is similar to OSPFv2 in that it uses a multicast address as the destination address of OSPF packets

OSPFv2 and OSPFv3 have the same types of messages: Hello, DD, LSR, LSU, LSA ack, and their message formats are the same

The protocol number of OSPFv2 in the IPv4 packet header is 89, and the next header number of OSPFv3 in the IPv6 packet header is 89

123. The four routers running IS-IS have established adjacency relationships. The area numbers and router levels are marked as shown in the figure. Which of the following statements is correct?

The LSP of R3 does not exist in the LSDB of the R2 router

The LSP of R4 does not exist in the LSDB of the R1 router

The LSP of R4 does not exist in the LSDB of the R2 router

The LSP of R4 does not exist in the LSDB of the R3 router

124. As shown in the figure, the AS100 has two paths to the AS400. By default, the best route is

transmitted from the AS200. It is known that the path to the AS400 through the AS300 is better. Therefore, the following configuration is performed on the R2. After the configuration is complete, the optimal route is

not changed. Which of the following operations can make the configuration take effect?

[R2] ip as-path-filter 1 permit ^400$

R2] route-policy med permit node 10

r2-route-policy] if-match as-path-filter 1

Ir2-route-policy] apply cost 20

Configure deterministic-med in the BGP process of R1.

Configure compare- different-as-med in the BGP process of R2.

Configure deterministic-med in the BGP process of R2.

Configure compare- different-as-med in the BGP process of R1.

125. Which of the following descriptions are wrong about BGP load sharing? (Multiple Choice)

IBGP routes and EBGP routes arriving at the same destination on the public network can form load balancing.

If BGP load balancing is implemented, the local device needs to be configured with the peer next-hop-local command to change the next hop address to its own address when advertise router to the IBGP peer group.

The destination network segment is the same, and BGP routes with different sources can form load sharing.

The AS_Path attribute of the equal-cost route that forms load sharing must be different.

126. Traditional BGP-4 can only manage IPv4 unicast routing information. In order to provide support for multiple network layer protocols, MP-BGP extends BGP-4.

MP-BGP uses address families to distinguish different network layer protocols. Which of the following address families are currently supported? (Multiple Choice)

BGP-VPNv4 address family

BGP-IPv6 unicast address family

BGP-VPN instance IPv6 address family

DBGP-IPv4 broadcast address family

127. Which of the following description about the label space of MPLS is wrong?

When the penultimate hop LSR performs label switching, if the value of the label after the exchange is found to be 3, the label will be ejected by default and the packet will be sent to the last hop

If the outgoing label value is 0, the router will directly discard the packet

Above 1024 is the label space shared by dynamic signaling protocols such as LDP, RSVP-TE, MP-BGP, etc.

16~1023 is the label space shared by static LSP and static CR-L SP

128. Which descriptions are correct about the BGP reflector? (Multiple Choice)

IBGP neighbor relationships need to be fully interconnected without a route reflector. The introduction of route reflectors can reduce the requirements for full interconnection

The route reflector can advertise the routes learned from the non-client to all clients.

The route reflector can advertise other clients and non-clients from the routes learned from one client.

The route reflector can advertise all clients and non-clients from routes learned from IBGP neighbors.

129. There are two Community-fiter:

ip communityfiter 1 pemit 100:1 200:1

ip community-filter 2 pemit 100:1

ip commmunityfiter2 pemit 200:1

Which of the following description about the above communityfite is correct? (Multiple choice)

A BGP route matches community-filter 1 as long as the community attributes carried in the route contain 100:1 or 200:1, or both.

A BGP route matches community-filter 2 as long as the community attributes carried in the route contain 100:1 or 200:1, or both.

A BGP route matches community-filter 1 only when the community attributes carried in the route contain both 100:1 and 200:1.

A BGP route matches community-filter 2 only when the community attributes carried in the route contain both 100:1 and 200:1.

130. The IPv6 link-local address can be generated through stateless automatic configuration.

TRUE

FALSE

Page 14 of 15

131. Regarding the description of the label encapsulation format in MPLS, which is correct? (Multiple questions)

The TTL field in the label is similar to the TTL (Time To Live) in the IP packet, and it also has the effect of preventing loops.

The total length of a single MPLS label is 4 bytes (32 bits)

For Ethernet and PPP packets, the label stack is like a "cushion", located between the Layer 2 header and the data. When there is a VLAN tag, the MPLS header is placed between the Ethernet header and the VLAN tag.

The S field in the label, 1bit is used to identify whether the label is the bottom label of the stack, when the value is 1, it indicates the second-to-last label

132. Regarding the processing mode of MPLS for TTL, which description is correct?

In Pipe mode, when an IP packet passes through the MPLS network, the IP TTL is decremented by 1 to the MPLS TTL field on the ingress node.

The TTL of the MPLS label has the same meaning as the TTL in the IP header, which can prevent the MPLS network from generating a routing loop

Uniform simulation, when the IP packet passes through the MPLS network, the IP TTL of the ingress node is decremented by 1, and the MPLS TTL field is a fixed value.

In MPLS VPN, if you want to hide the structure of the MPLS backbone network, you can use the uniform mode for Ingress packets for private network packets.

133. Which of the following description is wrong about the MAC address spoofing attack?

Attackers can implement MAC address spoofing attacks by sending data frames with forged source Mac addresses to the switch

MAC address spoofing attacks will cause the data that the switch to send to the correct destination is sent to the attacker

MAC address spoofing attacks will cause the switch to learn the wrong mapping relationship between Mac address and IP address

MAC address spoofing attacks mainly use the switch Mac address learning mechanism

134. As shown in the following figure, a part of the LSP of the LSDB of a router is shown in the first line of the figure. First received a new LSP, the second hop in the following picture, which of the following statement is wrong?

The router will put the newly received LSP into the LSD

This router will ignore the LSP received from the neighbor.

If it is a point-to-point network, this router will send PSNP

If it is a broadcast network, the DIS will include the summary information of the LSP in the next CSNP packet

135. What improvements have been made to the IGMPv2 protocol compared to IGMPv1? (Multiple

Choice)

Added specific group query message

Added off-group messages

Added maximum response time field

Added specific source group query messages

136. In addition to stateless address autoconfiguration, IPv6 devices can also obtain information such as

addresses, gateways, and DNS through DHCPv6.

True

False

137. In order to reduce the number of OSPF routes in some stub areas, OSPF has developed a special

area function. Which of the following description is true about the OSPF special area feature?

Special area routers cannot establish OSPF neighbor relationships with regular area routers

Any OSPF area can be configured as a special area

As -External-lsa is released to the Stub area

ASBR-Summary-LSA is allowed to be advertised to the NSSA area.

138. Which of the following description is true about BGP aggregation?

After the Aggregate ipv4-address mask is configured, only the aggregated routes are advertised and the detailed routes are not advertised.

For IPv6 routes, BGP supports manual aggregation and automatic aggregation.

BGP enables automatic aggregation by default

Manually aggregate routes in the BGP local routing table.

139. Which of the following statements about 802.1x authentication, RADIUS, and HWTACACS

authentication is correct? (Multiple Choice)

RADIUS authentication and HWTACACS authentication can perform dual authentication for the same user at the same time, which is more secure.

Users can access the network using 802.1x authentication and complete identity authentication through Radius.

RADIUS authentication and HWTACACS authentication are mutually exclusive. You cannot perform dual authentication for the same user at the same time.

RADIUS authentication and 802.1x authentication are mutually exclusive.

140. When configured ISIS the area authentication, which ISIS packets will carry the Bands authentication information?

SNP and LSP of Level-1 of ISI

SNP and LSP of LeveL-2 of ISI

Hello packets of Level-1 of ISI

Hello packets of Level-2 of ISI

Page 15 of 15

141. An existing router running OSPF is connected to Zone 0 and Zone 1. You configure zone 1 as a stub area. What types of LSA are only operating inside Zone 1?

Type 7 LSA

Type 1 LSA and Type 2 LSA

Type 1 LSA, Type 2 LSA and Type 5 LSA

Type 3 LSA and Type 4 LSA

Type 1 LSA, Type 2 LSA and Type 3 LSA

142. In the OSPF broadcast network, there are 4 routers RTA, RTB, RTC, and RTD in the same network segment. The DR priorities are 2, 1, 1, and 0 respectively, and the router IDs are 192.168.1.1 and 192.168.2.1, 192.168.3.1 and 1924.1 respectively.

If the OSPF protocol is enabled on the 4 routers at the same time, the BDR selected by OSPF is _____.

RTB

RTC

RTD

RTA

143. Which of the following description about multi-instance CE features is wrong?

Since the MCE device is already bound to the VPN, there is no need to bind the VPN on the PE connected to the MCE device.

The interface of the MCE device root media receiving the routing information base can determine the technical source of the routing information base and maintain it in the routing and forwarding table of the corresponding VP

The implementation principle of MCE is to create respective routing and forwarding tables for different VPNs on the MCE equipment and bind them to the corresponding interfaces.

Configure MCE to enable one CE to connect to multiple VPNs at the same time, which can achieve complete isolation of services between different VPN users and reduce the investment cost of network equipment.

144. As shown in the figure, there are two IPv6 networks that can access the IPv4 network. At the same time, an IPSEC tunnel needs to be established between the two IPv6 networks for communication. Which of the following encapsulation modes can meet the requirements above?

ESP + tunnel mode

None of the above options

AH + transmission mode

AH + tunnel mode

145. RSTP provides different protection functions in different scenarios. Which statement is wrong? (Multiple choice)

Enable the designated port of root protection. When the port receives a better RST BPDU, the port will enter the Discarding state and no longer forward packets. If the port does not receive a better RST BPDU within a period of time, it will automatically return to the normal Forwarding state

The designated port with root protection function enabled, its end [role can only remain as designated port

After the BPDU protection function is activated on the switching device, if the edge port receives the RST BPDU, the edge port will be set as a non-edge port, and the spanning tree calculation will be performed again

After the anti-TC-BPDU packet attack function is enabled, the number of times the switching device processes TC BPDU packets in a unit time can be configured

H12-261_V3.0 HCIE Routing & Switching Certification Questions

H12-261_V3.0 HCIE Routing & Switching Certification Questions

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