GB0-391 Constructing Secure optimized WANs v2.0 Exam Training Material

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Constructing Secure optimized WANs v2.0 GB0-391 exam training material is online, which is helpful for you to earn H3CSE Routing & Switching certification. There are 50 single/multiple choice questions, judgment questions, and gap-filling questions in the real H3C GB0-391 exam, and you have 60 minutes to write the test. The required passing score for the GB0-391 exam is 600. Free Constructing Secure optimized WANs v2.0 GB0-391 exam training material is below.

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1. Which of the following statements about access networks is correct? (Multiple choice)

Access usually refers to the connection between the user network and the operator's central computer room close to the user network.

Compared with the backbone network, the access network is often the bottleneck of network transmission speed.

The access network usually includes user transmission systems, multiplexing equipment or user network terminal equipment

The access network can also be Ethernet

2. Among the control messages defined by the MPCP protocol, the one sent by the OLT is ______. (Multiple choice)

GATE

Report

Register_Req

Register_Ack

3. Which of the following statements about VLAN planning in EPCN networks is correct? (Multiple choice)

The PSPV method uses the same VLAN to tag all services of the same user, and the service quality cannot be guaranteed.

In PUPV mode, all users in the community share the same service vlan id.

PUPSPV mode can accurately identify users and services. Each service of each user has a corresponding vlan id identification.

The deployment of PUPSPV mode requires the device to support QinQ technology.

4. Compared with IPsec VPN, which of the following advantages does SSL VPN have? (Multiple choice)

No client

Installation-free and maintenance-free client

Fast

Highly fine-grained access control

5. In the message encapsulated by the GRE protocol, the payload protocol is the IPX protocol and the bearer protocol is the IP protocol. The encapsulation sequence of the message from the link layer to the payload data is the link layer ____GRE____ payload data.

IP ， IPX

IPX ， IP

IP ， IP

IPX ， IPX

6. Use PC as a client and use client LAC mode to establish an L2TP tunnel through iNode and LNS. If the user logs in successfully but cannot communicate normally, the possible reason for this problem is?

Incorrect username and password

Tunnel interface verification fails

The public network transmission from the remote system to the LNS is unstable

LNS fails LAC authentication

7. Which of the following statements about PKI workflow is correct? (Multiple choice)

Certificate application is submitted by the entity

Entity identity verification is completed by CA

The certificate is issued by RA

The entity needs to apply to the CA to revoke the certificate

8. Which of the following statement about IKE is correct? (Multiple choice)

The first phase of IKE exchange modes has main mode and quick mode.

IKE SA is generated when the second phase of IKE is completed.

Authentication is required for key exchange in both IKE modes.

IKE uses asymmetric key algorithm when exchanging keys

9. Which of the following descriptions include that do not belong to the handshake layer functions of the SSL protocol? (Multiple choice)

Responsible for establishing and maintaining SSL sessions

Ensure data transmission is reliable

Close SSL connection under abnormal circumstances

Verify data integrity

10. MPLS forwarding medium pressure label (PUSH) operation occurs on what device in the MPLS network?

The packet enters the LER device on the MPLS network

On all LSR devices in the middle of the MPLS network

The packet leaves the LER device of the MPLS network address

On all devices in the MPLS network

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11. Which of the following description of the relationship between RT and RD is wrong? (Multiple choice)

The RT value of the same VPN must be the same as the RD value

The RD value is one of the Import Target attribute or Export Target attribute list of the RT attribute of the VPN to which it belongs.

The RD values and RT attribute values of different VPNs on the same device cannot be configured to be the same.

12. Which of the following information about the private network route learned from the remote end through the MP-BGP protocol will be recorded by the PE? (Multiple choice)

The RT Import Target attribute of the private network route

The private network label of the private network route

The RD value of the private network route

13. The changes of MP-BGP protocol compared to BGP protocol include? (Multiple choice)

Added MP REACH NLRI attribute

Added MP UNREACH NLRI attribute

Add the Extended Communities attribute

Add VPNv4 address family

14. Which of the following statements about DOS attacks are correct? (Multiple choice)

DOS attacks aim to reduce the service provision capability of the attacked system.

For TCP FLOOD attacks in DOS attacks, the TCP proxy mechanism can be used to defend against them.

For FTP FLOOD attacks in DOS attacks, you can limit the number of connections per second for defense.

For DOS attacks, you can prevent it by configuring the corresponding access control list on the network device.

15. Which of the following statement about the symmetric encryption algorithm is correct? (Multiple choice)

Symmetric encryption algorithm is more efficient

Symmetric encryption algorithm is suitable for environments where large amounts of data are transmitted

Symmetric encryption algorithms include AES, 3DES, DES, etc.

The security of the symmetric encryption algorithm completely depends on the security of the key itself

16. Which of the following are measurement standards for voice quality? (Multiple choice)

MOS

RESEARCH

PQSM

PSQM

17. A company's PBX is connected to the operator's telephone network through a T1 line. Due to the expansion of the company's scale, it needs to be able to meet the concurrency requirements.

50 voice calls, do I need to apply for another ____ T1 line?

18. In a VoIP network where calls are made through a gatekeeper, what will happen when the gatekeeper cannot determine the location information of the called terminal within its jurisdiction?

The calling party replies with a Gatekeeper Reject (GRJ) message

Reply to the calling party with a Location Rejection (LRJ) message

Reply to the calling party with a permission rejection (ARJ) message

None of the above answers are correct

19. During the SIP UA registration process, a response message with status code 401 was received, indicating ____?

UA has been registered to the registration server normally

Indicates that the request message sent by the UA contains fields that are not recognized by the server, but have been ignored by the server. The UA is still registered successfully.

Indicates that the server requires the UA to send authentication information. After receiving the response, the UA will send its own authentication information to the registration server through the second registration request.

Indicates that the request message sent by the UA contains fields that the server does not recognize and the registration failed.

20. Configure the following commands on the S3610 switch:

qos map-table dotlp-ip

import 1 export4

import 2 export 5

interface Ethernet1/0/8

port link-mode bridge

port link-tpe trunk

port trunk permit vlan 1 4

qos trust dotlp

interface Ethernet1/0/9

port link-mode bridge

port link-tpe trunk

port trunk permit vlan 1 4

qos gts an cir 65000 cbs 2000000

Then when the traffic is 40Mbps, the packets with vlan id 4 and 802.1p priority 1, and the traffic 40Mbps, the packets with vlan id 4 and 802.1p priority 2 enter from port E 1/0/8 at the same time, when forwarding from port E1/0/9, which of the following statement is correct? (Multiple choice)

80Mbps packets are forwarded normally

Packet traffic shaping is forwarded to 65Mbps

802.1p packets with priority 1 are lost on egress port E1/0/9

All 802.1p packets with priority 1 are forwarded on port E1/0/9.

802.1p priority 2 packets are lost on egress port E1/0/9

All 802.1p priority 2 packets are forwarded on egress port E1/0/9

Some configurations are incorrect

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21. Use the command on the MSR router:

dis qos wfq interface GigabitEthernet 0/1

Get the following information:

Interface: GigabitEthernet0/1

Output queue: （ Urgent queuing: Size/Length/Discards ） 0/100/0

Output queue: （ Protocol|queuing: Size/Length/Discards ） 0/500/0

Output queue: （ Weighted Fair queuing: Size/Length/Discarcds ） 1023/1024/52719

Hashed b DSCP

Hashed queues 1/2/64 （ Active/Max active/Total ）

which of the following statement is correct? (Multiple choice)

The port uses WFQ queue, and the weight type is DSCP

The port uses WFQ queue, and the weight type is IP priority.

The number of currently activated queues is 2

The maximum number of queues activated in history is 2

The maximum length of the queue is 1024. There is currently data congestion and packet loss.

22. Configure the MSR router with the following commands:

acl number 2001

rule o permit source 192.168.2.0 0.0.0.255

acl number 2002

rule o permit source 192.168.3.0 0.0.0.255

acl number 2003

rule o permit source 192.168.0.0 0.0.0.255

#

traffic classifier 2 operator or

if-match acl 2001

if-match classifier 1

traffic classifier 1 operator and

if-match acl 2002

if-match acl 2003

#

traffic behavior 2

filter deny

#

police officer 2

classifier 2 behavior 2

#

interface GigabitEthernet0/1

port link-mode route

ip address 192.168.1.1 255.255.255.0

qos appl polic 2 0utbound

Then when the packets with source addresses 192.168.2.2, 192.168.3.2, and 192.168.0.2 are forwarded from port GO/1, which of the following statement below is correct? (Multiple choice)

Packets with source address 192.168.2.2 are forwarded normally

Packets with source address 192.168.3.2 are forwarded normally

Packets with source address 192.168.0.2 are forwarded normally

The packets of the three streams are blocked.

23. Configure the MSR router with the following commands:

acl number 2000

rule 0 permit source 192.168.0.0 0.0.0.255

acl number 2002

rule 0 permit source 192.168.2.0 0.0.0.255

#

traffic classifier 2 0perator and

if-match acl 2002

traffic classifier 1 operator and

if-match acl 2000

#

traffic behavior 2

queue of bandwidth per cent 30

traffic behavior 1

queue ef bandwidth pct 30 cbs-ratio 25

qos policy test

classifier 1 behavior 1

classifier 2 behavior 2

interface GigbitEthernet0/1

port link-mode route

duplex full

speed 10 // The interface is 10Mbps

ip address 192.168.1.1 255.255.255.0

qos reserved-bandwidth pct 90 // Reserve 90% of the available bandwidth,

qos appl polic test outbound

When the packet traffic rates with source addresses 192.168.0.2, 192.168.2.2, and 192.168.3.2 are 4Mbps, 4Mbps, and 5Mbps respectively, and there is no other background traffic, they are forwarded from port G0/l. Which of the following statement is incorrect? (Multiple choice)

The forwarding rate of packets with source address 192.168.0.2 is about 4Mbps

The forwarding rate of packets with source address 192.168.0.2 is about 3Mbps

The forwarding rate of packets with source address 192.168.0.2 is about 2.7Mbps

The forwarding rate of packets with source address 192.168.2.2 is about 4Mbps

The forwarding rate of packets with source address 192.168.2.2 is about 3Mbps

The packet forwarding rate with the source address 192.168.2.2 is about 2.7Mbps

24. Which of the following levels does the SOA - based network architecture divide enterprise IT systems into? (Multiple choice)

Network layer

Session layer

Application layer

Infrastructure layer

25. Which of the following levels does the SOA - based network architecture divide enterprise IT systems into? (Multiple choice)

Application layer

Business layer

Network layer

Service layer

26. Which of the following levels does the SOA - based network architecture divide enterprise IT systems into? (Multiple choice)

Data layer

Service layer

Business layer

IP network layer

27. Which of the following statement about SOA and IToIP is correct? (Multiple choice)

SOA solutions require the integration of IT infrastructure and the establishment of a unified IT infrastructure platform based on network technology.

SOA is based on the network, eliminates the information gap caused by heterogeneous systems, integrates various services such as storage, security, and multimedia, and realizes the componentization and resourceization of IT infrastructure.

IToIP solution embodies the core idea of SO

IToIP allows for the flexible, fast and efficient construction of enterprise intelligent applications, and can quickly adapt to changes in enterprise business processes.

28. Which of the following statements about IToIP is incorrect?

IToIP requires building IT systems based on IP networks.

Various IT resources can easily share and use standard IP infrastructure to achieve further integration of various technologies and applications such as communication, computing, storage, and networks.

IToIP closely connects applications and infrastructure, greatly improving the operating efficiency of IT systems.

The IT system built based on IToIP can create a standard, compatible, secure, intelligent and manageable IT application for users. environment.

29. xz company requires building its network based on a modular enterprise network architecture. Company Z has one R&D base in Shenzhen and Xi'an, and one office building in Beijing and Shanghai; it has offices with more than 50 people in 23 provincial capital cities; it has small offices with no more than 8 people in 200 small and medium-sized cities. There are typically over 200 marketing and technical staff traveling at any given time. Company Z strictly prohibits employees from using the company network to access non-work-related websites.

According to these circumstances, the network module that Company Z should have____. (Multiple choice)

Large branch network

Remote / distributed office network

Internet access

Dedicated line / packet switching access

30. xz Company requires building its network based on a modular enterprise network architecture. Company Z has one R&D base in Shenzhen and Xi'an, and one office building in Beijing and Shanghai; it has offices with more than 50 people in 23 provincial capital cities; it has small offices with no more than 8 people in 200 small and medium-sized cities. There are typically over 200 marketing and technical staff traveling at any given time. Due to environmental and cost issues, some offices are unable to connect to the headquarters via dedicated lines or packet-switched WAN connections. According to these circumstances, the network module that Company Z should have ____. (Multiple choice)

Large branch network

Dedicated line / packet switching access

Remote / distributed office network

VPN access

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31. XZ Company requires building its network based on a modular enterprise network architecture. Company Z has one R&D base each in Shenzhen and Xi'an; one office building each in Beijing and Shanghai; offices with more than 50 people in 23 provincial capital cities; small offices with no more than 8 people in 200 small and medium-sized cities; There are usually more than 200 marketing and technical personnel on the road at any time, and some of them are often located in areas lacking Internet access and can only connect to the headquarters through dial-up telephone networks. Due to environmental and cost issues, some offices are unable to connect to the headquarters via dedicated lines or packet-switched WAN connections.

According to these circumstances, the network module that Company Z should have _____. (Multiple choice)

Dial-up access

Secure Authentication

VPN access

Large branch network

32. Advantages of modular network architecture include ____.

It replaces the traditional hierarchical network model and facilitates network planning and deployment.

Allow different application functions or application systems to share data, resources and capabilities and participate in business processes.

Allow IT resources to be dynamically called through open interfaces to achieve a standard, compatible, secure, intelligent and manageable IT application environment.

Each module can be planned and deployed separately, and network functions can be added or removed by adding or deleting modules, which is beneficial to building complex networks.

33. The following functions of the aggregation layer are ____.

Has a large number of interfaces for connecting to end-user computers

Access security control

High-speed packet switching

Complex routing strategy

34. The following core layer functions are ____. (Multiple choice)

Has a large number of interfaces for connecting to end-user computers.

Access security control

High-speed packet switching

Necessary routing strategy

35. The following functions of the access layer are ____. (Multiple choice)

Has a large number of interfaces for connecting to end-user computers

Access security control

High-speed packet switching

Complex routing strategy

36. The advantages of the hierarchical network model include___. (Multiple choice)

Enhance network scalability

Improve network throughput

Reduce end-to-end delay

Facilitate network maintenance

37. Among the following broadband access transmission media, the highest transmission rate that can be achieved is ____.

Coaxial cable

Copper twisted pair

Radio waves

Optical fiber

Power lines

38. Among the following broadband access transmission media, those that are more suitable for covering remote areas without traditional communication lines include? (Multiple choice)

Coaxial cable

Copper twisted pair

Radio waves

Optical fiber

Power lines

39. Among the following optical fiber access methods, the one with the highest degree of fiberization is?

FTTC

FTTH

FTTB

FTTA

40. Among the following options, the one that belongs to the co -side equipment is ____. (Multiple choice)

Access switch

Access the server

cable modem

DSLAM

Set-top box

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41. Among the following options, the one that belongs to CPE is ___. (Multiple choice)

Access switch

Access the server

Broadband Router / Modem

DSLAM

Set -top box

cable modem

42. Which of the following PPPoE messages are sent in broadcast form? (Multiple choice)

PADI （ PPPoE Active Discover Initiation ）

PADO （ PPPoE Active Discover Offer ）

PADR （ PPPoE Active Discover Request ）

PADS （ PPPoE Active Discover Session-Confirmation ）

PADT （ PPPoE Active Discover Terminate ）

43. Which of the following PPPoE packets may contain valid PPP Session-ID information? (Multiple choice)

PADI （ PPPoE Active Discover Initiation ）

PADO （ PPPoE Active Discover Offer ）

PADR （ PPPoE-Active Discover Request ）

PADS （ PFoPoE Active Discover Session-Confirmation ）

PADT （ PPPoE Active Discover Terminate ）

44. During the PPPoE negotiation process, which of the following PPPoE packets must contain Service-Name information? (Multiple choice)

PADI （ PPPoE Active Discover Initiation ）

PADO （ PPPoE Active Discover Offer ）

PADR （ PPPoE Active Discover Request ）

PADT （ PPPoE Active Discover Terminate ）

45. In the PPP Session phase of PPPoE, in the Ethernet data frames exchanged between PPPoE client and PPPoE server, the destination MAC address can be ___. (Multiple choice)

Broadcast MAC address _

Multicast MAC address _

MAC address of PPPoE client

MAC address of PPPoE server

46. Please add the correct parameters in the following PPPoE Client settings:

[HG] dialer-rule 1 ip permit // Configure dial-up access group 1 and corresponding dial-up access control conditions

[HG] interface dialer 2 // Create Dialer 2 interface

[HG-Dialer1] dialer user userl

[HG-Dialer1] dialer-group________ // Associate Dialer 2 interface with dial-up access group 1.

[HG-Dialer1] dialer bundle _______ // configuration dialer bundle number

[HG-Dialer1] ip address ppp-negotiate

[HG-Dialer1] ppp pap local-user user1 password simple pass1

[HG] interface ethernet 0/0

[HG-Ethernet0/0] pppoe-client dial-bundle-number 10 // Configure a PPPoE session, which corresponds to

Dialer bundle 10

47. In Ethernet access applications, the correct statements about the deployment of access points AN and aggregation equipment AGG at the edge of the operator's access network are ___. (Multiple choice)

When AN adopts Layer 2 switches, it can achieve higher density of end-user access than Layer 3 switches.

When AN uses Layer 2 switches, complex Layer 2 isolation and security features need to be supported and deployed on the AN and AG

When AN uses a three-layer switch, it is more helpful to control the scope of the broadcast domain than a two-layer switch.

When AN adopts a three-layer switch, the maximum number of user terminals that an AGG device can connect will no longer be limited by the number of its own MAC address table entries.

48. In PPPoE applications, the Ethernet MAC address of the access end is determined in the _____ stage of PPPoE.

49. The cable used in the 1000BASE-T standard of Ethernet is _____, and the maximum transmission distance is ______.

2 pairs of Category 5 UTP twisted pairs, 100m

Multimode optical fiber, 2000m

4 pairs of Category 3 UTP twisted pairs, 100m

Single mode optical fiber, 5000m

4 pairs of Category 5 UTP twisted pairs, 100m

2 pairs of STP twisted pairs, 25m

50. The cable used in the 1000BASE-LX standard of Ethernet is _______ and the maximum transmission distance is ______.

2 pairs of Category 5 UTP twisted pairs, 100m

Multimode optical fiber, 550m

4 pairs of Category 3 UTP twisted pairs, 100m

Single mode optical fiber, 5000m

4 pairs of Category 5 UTP twisted pairs, 100m

2 pairs of STP twisted pairs, 25m

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51. In a typical PPPoE network, both PPPoE Server and PPPoE Client are MSR routers. If you want PPPoE to work in permanent online mode, which of the following configurations need to be performed?

Configure on PPPoE Server: [RTA-virtual-Templatel] pppoe-client dial-bundle-number 1

Configure on the PPPoE Client: [HG-Dialer l] pppoe-client dial-bundle-number l

Configure on the PPPoE Client: [HG-Ethernet0/0] pppoe-client dial-bundle-number 1

Configure on the PPPoE-Server ： [RTA-Virtual-Templatel] pppoe-client dial-bundle-number l idle-timeout 65535

Configure on the PPPoE Server: [RTA- Ethernet0/0] pppoe-client dial-bundle-number 1

Configure on the PPPoE Client: [HG-Dialerl] pppoe-client dial-bundle-number l idle-timeout O

52. In a typical PPPoE network, both PPPoE Server and PPPoE Client are MSR routers. If you want the PPPoE session to automatically disconnect after being idle for 3 minutes, which of the following configurations need to be performed?

Configuration on PPPoE Server ： [RTA-Virtual--Template1] pppoe-client dial-bundle-number l idle-timeout 180

Configuration on PPPoE Client: [HG-Dialerl] pppoe-client dial-bundle-number 1 idle-timeout 3

Configuration on PPPoE-Client: [HG-Dialerl] pppoe-client dial-bundle-number 1 idle-timeout 3

Configuration on PPPoE-Server: [RTA-Virttual-Template1] pppoe-client dial-bundle-number 1 idle-timeout 3

Configuration on PPPoE Server: [RTA-Ethernet0/0] pppoe-client dial-bundle-number 1 idle-timeout 180

Configure on the PPPoE Client: [HG-Ethernet0/0] pppoe-client dial-bundle-number 1 idle-timeout 180

53. In the EPON system, the port through which the ONU device connects to the user is?

OLT

HIM

NNI

UNI

54. EPON ranging and delay compensation technology are the keys to uplink channel multiplexing, which are mainly realized through the _____ processing process defined by MPCP. (Multiple choice)

Discovery Processing

Registration Processing

Report Processing

Gate Processing

55. An enterprise has a large number of two-way video and voice communication requirements between its branches and the headquarters. If you want to choose a broadband access method to connect the branches and the headquarters, the most ideal of the following options is _____.

APON/BOPN

ADSL

EPON

56. Among the control messages defined by the MPCP protocol, the one sent by the ONU is _____. (Multiple choice)

GATE

Report

Register_Req

57. During the ONU registration process, the MPCP control message sent through the broadcast channel includes _____ (Multiple choice)

Ordinary GATE

Report

Register_Req

Discover GATE

58. During the ONU registration process, the MPCP control message sent through the unicast channel includes ____. (Multiple choice)

Ordinary GATE

Report

Register_Req

Register_Ack

Discover GATE

59. During the ONU registration process, the control message containing LLID (Logical Link ID, logical link identification) information includes ___. (Multiple choice)

Ordinary GATE

Report

Register_Req

Discover GATE

60. In the EPON network as shown in the figure, the OLT sends data to all ONUs (ONU1 to ONUn) in the network. Which of the following statement is correct? (Multiple choice)

There is data to all ONUs on line 0

There is data to all ONUs on line 1

There is only data to ONU2 on line 2.

The downlink data on lines 0 ~ n is the same.

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61. When the link type of the ONU port is Access, its processing method for upstream packets is ___.

Only allow packets without tags to pass through, and add the default VLAN tag to the packets.

Only allow packets with the default VLAN tag to pass through and remove the tag.

For received packets without tags, add the default VLAN tag, and for received packets with tags, forward them directly.

Only tagged packets are allowed to pass

62. When the link type of the ONU port is Access, its processing method for downlink packets is ___.

Only allow packets without tags to pass through, and add the default VLAN tag to the packets.

Only allow packets with the default VLAN tag to pass through and remove the tag.

For received packets without tags, add the default VLAN Tag. For received packets with tags, forward them directly.

Only tagged packets are allowed to pass

63. When the link type of the ONU port is Trunk, its processing method for upstream packets is ____.

Only allow packets without tags to pass through, and add the default VLAN tag to the packets.

Only allow packets with the default LAN Tag to pass through and remove the tags

For received packets without tags, add the default VLAN Tag; for received packets with tags, forward them directly.

Only tagged packets are allowed to pass

64. When the link type of the ONU port is Trunk, its processing method for downlink packets is ___.

Only allow packets without tags to pass through, and add the default VLAN tag to the packets.

Only allow packets with the default VLAN Tag to pass through and remove the tags

For received packets without tags, add the default VLAN Tag; for received packets with tags, forward them directly.

Only tagged packets are allowed to pass

65. In EPON applications, if the user's home gateway or switch is provided by the operator and uniformly manages VLAN, then the VLAN operation mode on the UNI port should be configured as ___.

VLAN tagging mode

VLAN transparent transmission mode

VLAN Translation mode

VLAN Tag mode

66. Among the commonly used VLAN division methods in EPCN networks, which method uses double-layer VLAN planning?

PUPV

PSPV

PUPSPV

PSV

67. For an 860MHz HFC network with one optical node covering 1,000 households, when the 64QAM modulation method is used, all the network bandwidth is used for point-to-point services. The average bandwidth per household is ____

7Mbps

5Mbps

3.5Mbps

12.5Mbps

10Mbps

68. The frequency range of baseband data signals used by common EoC technologies is generally ____

87MHz ～ 108MHz

0 ～ 30MHz

5 ～ 65Mhz

110MHz~1000MHz

69. According to the industry standard G/T 106-1999 "Technical Specifications for Cable TV Broadcasting System" of the People's Republic of China, the _____ band is used to transmit traditional analog TV programs, digital TV programs and VOD.

87MHz ～ 108MHz

0 ～ 30MHz

5 ～ 65MHz

110MHz ～ 1000MHz

70. Which of the following statements about EPCN is correct? (Multiple choice)

EPCN is a passive EoC technology, the user terminal is a passive device, and the system transmission loss tolerance is low, which limits its application scope to a certain extent.

EPCN is an active EoC technology, and user terminals are active devices, thus avoiding the limitations of network topology without passive EoC technology.

The EPCN system mainly deploys the coaxial distribution network part of the cable TV network, and mainly uses EPON technology to cooperate with it on the HFC backbone network.

EPCN complies with HFC- based broadband access specifications such as DOCSIS l.0/1.1/2.013.0.

Page 8 of 13

71. In the EPCN network as shown in the figure, when data is sent from CLT to users 1, 2, and 3, which of the following statements is correct? (Multiple choice)

End user 1 will receive packets 1, 2, and 3, but it only accepts packet 1 and discards packets 2 and 3.

CNU1 will only receive packet 1

CNU1 will receive packets 1, 2, and 3, but it will only send packet 1 to end user 1, discarding packets 2 and 3.

End user 1 will only receive package 1

CNU1 will receive packages 1, 2, and 3 and send them all to end user 1

72. Among the following DSL technologies, which one with the highest transmission rate?

ADSL

ADSL2+

VDSL

SHDSL

HDSL

73. In the PPPoE application of ADSL, when the CPE side uses an MSR router + ADSL Modem for networking, and the CO side DSLAM uses ATM for uplink, which interfaces need to be configured on the router on the CPE side? (Multiple choice)

DSL interface

Ethernet port

Virtual-Ethernet

Virtual-Template

Dial-up interface

74. In the PPPoE application of ADSL, when the CPE side uses an MSR router + ADSL interface card for networking, and the CO side DSLAM uses ATM for uplink, which interfaces need to be configured on the router on the CPE side (regardless of the LAN on the CPE side) connection)? (Multiple choice)

DSL interface

Ethernet port

Virtual-Ethernet

Virtual-Template

Dial-up interface

75. In the PPPoE application of ADSL, when the CPE side uses an MSR router + ADSL interface card for networking, and the CO side DSLAM uses ATM for uplink, which interfaces need to be PPPoE- related on the centralized router (PPPoE Server) on the CO side? (Multiple choice)

ATM interface

Ethernet port

Virtual-Ethernet

Virtual-Template

Dial -up interface

76. In the PPPoE application of ADSL, when the CPE side uses an MSR router + ADSL interface card for networking, and the co- side DSLAM uses IP for uplink, which interfaces need to be PPPoE- related on the centralized router (PPPoE Server) on the CO side? (Multiple choice)

ATM interface

Ethernet port

Virlual-Ethernet

Virtual-Template

Dial-up interface

77. The frequency band range used to transmit data in ADSL2+ is?

20KHz ～ 1MHz

0 ～ 4 KHz

1.1MHz ～ 2.2MHz

20KHz ～ 2.2MHz

Higher than 10MHZ

78. Among the following ADSL standards, the one which does not require the use of a splitter? (Multiple choice)

ITU 992.1

ITU 992.2

ITU 992.3

ITU 992.4

79. An operator hopes to deploy an ADSL (ADSL2) system in a community with relatively dense users and short transmission distance. Users do not have high requirements for bandwidth and pay more attention to its economy and ease of installation and maintenance. Based on the above requirements, the ideal choice when choosing the ADSL (ADSL2) standard is __. (Multiple choice)

ITU 992.1

ITU 992.2

ITU 992.3

ITU 992.4

80. The theoretical transmission rate of ADSL data is related to which of the following options? (Multiple choice)

Line activation negotiation results

Number of sub-bearer channels

Modulation rate

Sub-bearer channel rate

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81. The VPI/VCI parameters of the ADSL connection are determined through negotiation in ___.

Line activation

DMT modulation

Establish low-layer link VCC

PPPoE negotiation

82. Common VPI/VCI values in ADSL applications include? (Multiple choice)

0/30

0/35

0/32

0/16

83. Which of the following statements about the improvements of ADSL2 over ADSL is correct? (Multiple choice)

ADSL2 has twice the frequency band range of ADSL

At the same transmission rate, ADSL2 can transmit longer distances than ADSL

ADSL2 adds a new operating mode compared to ADSL

ADSL can support flexible bandwidth binding functions, such as IMA (Inverse Multiplexing for ATM, ATM inverse multiplexing)

84. Among the following VPN technologies, which belong to the third layer of VPN? (Multiple choice)

L2TP VPN

BGP/MPLS VPN

VLL

IPSec VPN

85. Among the following VPN technologies, which belong to the second layer VPN? (Multiple choice)

VPLS

VLL

GRE VPN

IPSec VPN

86. Which of the following VPN technologies are suitable for corporate employees to remotely access corporate private networks through the Internet? (Multiple choice)

SSL VPN

L2TP VPN

GRE VPN

BGP/MPLS VPN

87. Which of the following VPN technologies is suitable for corporate employees traveling on business trips to remotely access corporate networks through the Internet?

BGP/MPLS VPN

GRE VPN

SSL VPN

VLL

88. Which of the following description about L2TP VPN and GRE VPN is wrong? (Multiple choice)

They are all point-to-point VPNs.

Both support tunnel verification

Both support dynamic address acquisition.

They are all based on UDP encapsulation

89. Which of the following description about L2TP VPN and GRE VPN is correct? (Multiple choice)

They are all point-to-point VPNs.

Both support tunnel verification

All belong to L3 VPN (Laer 3 VPN, three-layer VPN) technology

They are all based on IP encapsulation

90. Which of the following descriptions about L2TP VPN and SSL VPN is correct? (Multiple choice)

All need to install and maintain the client

All support Web access methods

All support IP access methods

They are all based on UDP encapsulation

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91. Which of the descriptions about L2TP VPN and SSL VPN are wrong? (Multiple choice)

There is no need to install or maintain the client.

All support Web access methods

All support IP access methods

They are all based on TCP encapsulation

92. According to different network levels, VPN can be divided into which of the following types? (Multiple choice)

Intranet VPN

Internet VPN

Layer2 VPN

Layer3 VPN

93. According to different operating modes, VPN can be divided into which of the following types? (Multiple choice)

Intranet VPN

Internet VPN

CPE-Based VPN

Network-Based VPN

94. Which of the following descriptions of GRE VPN and BGP/MPLS VPN are correct?

Both address spaces can be separated.

They are all point-to-point tunnels

GRE VPN can separate address spaces, but BGP/MPLS VPN cannot separate address spaces.

GRE VPN cannot separate address spaces, but BGP/MPLS VPN can separate address spaces.

95. Which of the following descriptions of GREVPN and BGP / MPLS VPN are correct?

Both address spaces can be separated.

They are all point-to-point tunnels

GREVPN does not separate address spaces, but BGP/MPLS VPN can separate address spaces.

GRE VPN can provide advanced security such as data encryption, but BGP/MPLS VPN cannot provide such security.

96. Which of the following descriptions about the GRE is incorrect? (Multiple choice)

The bearer IP header identifies the GRE header with UDP port number 47

GRE uses Ethernet protocol type Ox0800 to identify the payload packet as IP

GRE VPN is limited to transmitting unicast data

Using IP over IP GRE encapsulation method, the public network and private network interface addresses can overlap.

97. Which of the following descriptions about GRE are correct? (Multiple choice)

The bearer IP header identifies the GRE header with IP protocol number 47

GRE uses Ethernet protocol type Ox0806 to identify the payload packet as IP

GRE VPN can transmit multicast data

Using IP over IP GRE encapsulation method, the public network and private network interface addresses cannot overlap.

98. Which of the following descriptions about GRE are correct? (Multiple choice)

The bearer IP header identifies the GRE header with UDP port number 47

GRE uses Ethernet protocol type Ox0800 to identify the payload packet as IP

GRE VPN can transmit multicast data

Using IP over IP GRE encapsulation method, the public network and private network interface addresses can overlap.

99. Execute the display interface tunnel command on a router to display the GRE tunnel interface information as follows:

<Router> display interface Tunnel 0

Tunnel 0 current state: UP

Line protocol current state: UP

Description: Tunnel 0 Interface

The Maximum Transmit Unit is 1476

Internet Address is 192.1.2.1/24 Primar

Encapsulation is TUNNEL ， aggregation ID not set

Tunnel source 10.1.11.1 ， destination 10.1.13.1

Tunnel keepalive enable ， Period （ 10 s ）， Retries （ 3 ）

Tunnel protocol/transport GRE/IP

GRE key disabled

Checksumming of GRE packets disabled

Last 300 seconds input: 0 btes/sec ， 0 packets/sec

Last 300 seconds output: 0 btes/sec ， 0 packets/sec

4 packets input ， 72 btes

0 input error

1 packets output ， 24 btes

0 0utput error

Which can be known from the above information? (Multiple choice)

The tunnel interface is in the UP state, and the MTU is 1476 bytes.

The Tunnel interface has the Keeplive function enabled. Once the router does not receive a Keeplive message from the other party within 30 seconds, the tunnel is considered unavailable. Although the Tunnel interface is still in the UP state, this Tunnel interface is used as a static route for the outgoing interface. will disappear from the routing table;

The tunnel does not start verification, nor does it start verification

The tunnel source IP address is 192.1.1.1

100. Execute displa interface tunnel on a router to display the information of the GRE tunnel interface as follows:

<Router>displa interface Tunnel 0

Tunnelo current statle: UP

Line protocol current state: UP

Description: Tunnel 0 Interface

The Maximum transmit Unit is 1476

Internet Addess is 192.1.1.1/24 Primar.

Encapsulation isTUNNELT aggregation ID not- et

Tunnel source l0.1.11.1 destination 10.1.13.1

Tunnel keeepalive enable Period （ 10 s ）， Retries （ 3 ）

Tunnel protocol/transport GRE/IP.

GRE key disable

Checksumming of GRE packets disabled

Last 300 seconds input: O btes/secl 0 packet/sec.

Last 300 seconds output: O bytes/sec ， O packets/sec .

4 packets input 72bytes.

0 input error

1 packets output ， 24 btes

0 0utput error

From the above information we can know? (Multiple choice)

The tunnel interface is in the UP state, and the MTU is 1467 bytes.

The Keepalive function is enabled on the Tunnel interface. Once the router does not receive Keepalive messages from the other party within 30 seconds, the tunnel is considered unavailable.

Tunnel startup verification, no startup verification

The tunnel source IP address is 10.1.11.1

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101. Which of the following description about GRE VPN configuration is correct? (Multiple choice)

When configuring GRE VPN, whether static routing or dynamic routing is used, the Keepalive function should be enabled on the Tunnel interface to detect the actual working status of the tunnel interface.

The source address and destination address of the Tunnel interface uniquely identify a tunnel. The source address and destination address on the Tunnel interface of the devices at both ends of the tunnel must be the same.

After the Keepalive function is enabled on the Tunnel interface, by default, once the router fails to receive Keepalive messages from the other party three times, the tunnel is considered unavailable.

By default, the encapsulation mode of tunnel interface packets is GR

102. Which of the following descriptions about GRE VPN configuration is incorrect? (Multiple choice)

When configuring GRE VPN, if static routing is used, the Keeplive function should be enabled on all Tunnel interfaces to detect the actual working status of the tunnel interface. If dynamic routing is used, there is no need to enable the Keeplive function.

The source address and destination address of the Tunnel interface uniquely identify a tunnel. The source address and destination address on the Tunrel interfaces of the devices at both ends of the tunnel must be the same.

After the Keeplive function is enabled on the Tunnel interface, by default, once the router fails to receive Keeplive messages from the other party three times, the tunnel is considered unavailable.

By default, the encapsulation mode of tunnel interface packets is not GR

103. In the message encapsulated by the GRE protocol, the payload protocol is the IPX protocol and the bearer protocol is the IP protocol. The encapsulation sequence of the message from the link layer to the payload data is?

Link layer IP GRE IPX payload data

Link layer IPX GRE IP payload data

Link layer GRE IP IPX payload data

Link layer GRE IPX IP payload data

104. Four routers R1, R2, R3 and R4 are connected in sequence. Loopback0 interfaces are created on R1 and R4. The interface addresses are 1.1.1.1 and 4.4.4.4 respectively. The four devices are configured with static routing protocols respectively to ensure Loopback0 of R1 and R4. The address route is reachable. A GRE Tunnel is established between R1 and R4. Check the tunnel interface information on R1 as follows:

[R1] displa interface Tunnel 0

Tunnelo current state: UP

Tunnelo current statle: UP

Line protocol current state: UP

Description: Tunnel 0 Interface

The Maximum transmit Unit is 1476

Internet Addess is 10.1.1.1/30 Primar.

Encapsulation isTUNNEL aggregation ID not set

Tunnel source l.1.1.1 destination 4.4.4.4

Tunnel keeepalive disable

Tunnel protocol/transport GRE/IP.

GRE key disable

Checksumming of GRE packets disabled

Last 300 seconds input: 2 btes/secl 0 packet/sec.

Last 300 seconds output: 2 bytes/sec ， O packets/sec .

15packets input 840bytes.

0 input error

27packets output ， 1248btes

0 0utput error

At this time, if the link between R2 and R3 is interrupted, which of the following statement correct? (Multiple choice)

The Tunnel interface on R1 remains U

Tunnel interface status DOWN on R1

The IP address of the tunnel interface of R4 should be 10.0.0.2

The source IP of the tunnel interface of R4 is 4.4.4.4 and the destination IP is 1.1.1.1

105. Four routers R1, R2, R3 and R4 are connected in sequence. Loopback0 interfaces are created on R1 and R4. The interface addresses are 1.1.1.1 and 4.4.4.4 respectively. The four devices are configured with dynamic routing protocols respectively to ensure Loopback0 of R1 and R4. The address route is reachable. A GRE Tunnel is established between R1 and R4. Check the tunnel interface information on R1 as follows:

[R1] displa interface Tunnel 0

Tunnelo current state: UP

Line protocol current state: UP

Description: Tunnelo Interface

The Maximum Transmit Unit is 1476

Internet Address is 10.0.0.1/30 Primar

Encapsulation is TUNNEL ， aggregation ID not set

Tunnel source l.1.1.1 ， destination 4.4.4.4

Tunnel keepalive disable

Tunnel protocol/transport GRE/IP

GRE is disabled

Checksumming of GRE packets disabled

Last 300 seconds input: 2 btes/sec ， 0 packets/sec

Last 300 seconds output: 2 btes/sec ， 0 packets/sec

15 packets input ， 840 btes

0 input error

27 packets output ， 1248 btes

0 0utput error

At this time, if the link between R2 and R3 is interrupted, which of the following statement is correct? (Multiple choice)

The Tunnel interface on R1 remains U

Tunnel interface status DOWN on R1

The source IP of the tunnel interface of R4 is 1.1.1.1 and the destination IP is 4.4.4.4

The IP address of the tunnel interface of R4 should be 10.0.0.2

106. In GRE encapsulation of IP over IP, the hexadecimal value of the Protocol Tpe field of the GRE header is Ox___.

107. In the GRE encapsulation of IP over IP, IP uses the protocol number ____ to mark the GRE header.

108. As shown in the figure, the three routers create a GRE tunnel between Router1 and RouLer3. The configuration commands for the three routers are? (Multiple choice)

Router1:

[Router1] interface Serial 0/2/0

[Router1-Serial0/2/0] ip address 10.1.1.1 24

ERouter1] interface loopback 0

[Router1-LoopBackO] ip address 1.1.1.1 32

[Router1] interface Tunnel 0

[Router1-Tunnel0] source 10.1.1.1

[Router1-Tunnel0] destination 20.1.1.2

[Router1-Tunnel0] ip address 100.1.1.1 24

[Router1] ospf

IRouter1-ospf-1] area 0

IRouter1-ospf-1-area-0.0.0.0] network 10.1.1.1 0.0.0.255

[Router1] ip route-static 3.3.3.3 32 100.1.1.2

Router2:

[Router2] interface Serial 0/2/0

[Router2-Serial0/2/0] ip address 10.1.1.2 24

[Router2] interface Serial 0/2/1

[Router2-Serial0/2/0] ip address 20.1.1.1 24

[Router2] ospf

IRouter1-ospf-1] area 0

IRouter1-ospf-1-area-0.0.0.0] network 10.1.1.2 0.0.0.255

IRouter1-ospf-1-area-0.0.0.0] network 20.1.1.1 0.0.0.255

Router3:

[Router3] interface Serial 0/2/0

[Router3-Serial0/2/O] ip address 20.1.1.2 24

[Router3] interface loopback 0

[Router3-LoopBackO] ip address 3.3.3.3 32

[Router3] interface Tunnel 0

[Router3-TunnelO] source 20.1.1.2

[Router3-TunnelO] destination 1 0.1.1.1

[Router3-TunnelO] ip address 100.1.1.2

[Router3] ospf

[Router3-ospf-l] area 0

[Router3-ospf-l-area-0.0.0.0] network 20.1.1.2 0.0.0.255

[Router3] ip route-static l.1.1.1 32 100.1.1.1

Use the command ping-a 1.1.1.1 3.3.3.3 on Router 1 to check the connectivity, and 100% of the ICMP return packets are received.

In the above process, the following description of the processing process of data packets by each router is correct? (Multiple choice)

Router1 performs GRE encapsulation of ICMP Echo Request messages.

Router2 forwards IP packets

Router2 decapsulates the ICMP Echo Request message GRE

Router3 performs GRE encapsulation of ICMP Echo Reply messages.

109. As shown in the figure, the three routers create a GRE tunnel between Router1 and Router3. The configuration commands for the three routers are?

Router1 ：

[Router1interface Serial 0/2/0

[Router1-Serial0/2/0] ip address 10.1.1.1 24

[Router1interface loopback 0

[Router1-LoopBack0] ip address 1.1.1.1 32

[Router1] interface Tunnel 0

[Router1-Tunnel0] source 10.1.1.1

[Router1-Tunnel0] destination 20.1.1.2

[Router1-Tunnel0] ip address 100.1.1.1 24

[Router1] ospf

[Router1-ospf-l] area 0

[Router1-ospf-l-area-0.0.0.0] network 10.1 .1 .1 0.0.0.255 [Router1] ip route-static 3.3.3.3 32 100.1.1.2

Router2:

[Router2] interface Serial 0/2/0

[Router2-Serial0/2/0] ip address 10.1.1.2 24

[Router2] interface Serial 0/2/1

[Router2-Serial0/2/1] ip address 20.1.1.1 24

[Router2] ospf

[Router2-ospf-l] area 0

[Router2-ospf-l-area-0.0.0.0] network 10.1.1.2 0.0.0.255

[Router2-ospf-l-area-0.0.0.0] network 20.1.1.1 0.0.0.255

Router3:

[Router3] interface Serial 0/2/0

[Router3-Serial0/2/0] ip address 20.1.1.2 24

[Router3] interface loopback 0

[Router3-Loop Back0] ip address 3.3.3.3 32

[Router3] interface Tunnel 0

[Router3-Tunnel0] source 20.1.1.2

[Router3-Tunnel0] destination 10.1.1.1

[Router3-Tunnel0] ip address 100.1.1.2

[Router3] ospf

[Router3-ospf-l] area 0

[Router3-ospf-l-area-0.0.0.0] network 20.1.1.2 0.0.0.255

[Router3] ip route-static 1.1.1.1 32 100.1.1.1

Use the command ping-a 1.1.1.1 3.3.3.3 on the Router to check the connectivity. 100% of the icmp return packets are received.

During the advancement process, the following describes the processing process of data packets by each router. Which one is correct?

Router1 performs GRE decapsulation of ICMP Echo Request messages.

Router1 performs GRE encapsulation of ICMP Echo reply messages.

Router2 decapsulates the ICMP Echo Request message GRE

Router3 performs GRE encapsulation of ICMP Echo reply messages

110. As shown in the figure, the three routers create a GRE tunnel between Router1 and Router3. The configurations of the three routers are? (Multiple choice)

Router1:

[Router1] interface Serial 0/2/0

[Router1-Serial0/2/O] ip address 10.1.1.1 24

[Router1]interface loopback 0

[Router1-LoopBackO] ip address l.1.1.1 32

[Router1] interface Tunnel 0

[Router1-TunnelO] source 10.1.1.1

[Router1-TunnelO] destination 20.1.1.2

[Router1-TunnelO] ip address 100.1.1.1 24

[Router1] ospf

[Router1-ospf-l] area 0

[Router1-ospf-l-area-0.0.0.0] network 10.1.1.1 0.0.0.255

[Router1-ospf-l-area-OOOO] network 1.1.1.1 0.0.0.0

Router2:

[Router2] interface Serial 0/2/0

[Router2-Serial0/2/O] ip address 10.1.1.2 24

[Router2] Interface Serial 0/2/1

[Router2-Serial0/2/1] ip address 20.1.1.1 24

[Router2] ospf

[Router2-ospf-l] area 0

[Router2-ospf-l-area-0.0.0.0] network 10.1.1.2 0.0.0.255

[Router2-ospf-l-area-0.0.0.0] network 20.1.1.1 0.0.0.255

Router3:

[Router3] interface Serial 0/2/0

[Router3-Serial0/2/O] ip address 20.1.1.2 24

[Router3-Serial0/2/O] quit

[Router3] interface loopback 0

[Router3-Loop Back0] ip address 3.3.3.3 32

[Router3] interface Tunnel 0

[Router3-Tunnel0] source 20.1.1.2

[Router3-Tunnel0] destination 10.1.1.1

[Router3-Tunnel0] ip address 100.1.1.2

[Router3] ospf

[Router3-ospf-l] area 0

[Router3-ospf-l-area-0.0.0.0] network 20.1.1.2 0.0.0.255

[Router3-ospf-l-area-0.0.0.0] network 3.3.3.3 0.0.0.0

Use the command ping-a 1.1.1.1 3.3.3.3 on the Router to check the connectivity. 100% of the icmp return packets are received.

In the above process, which of the following description of the processing process of data packets by each router is correct? (Multiple choice)

Router1 performs GRE decapsulation of ICMP Echo Request messages.

Router 1 performs IP packet forwarding

Router 3 performs packet forwarding

Router3 performs GRE encapsulation of ICMP Echo repl messages

Page 12 of 13

111. In the GRE Tunnel interface view, configure the Keeplive packet sending period to 10s , the number of Keeplive packet transmissions required to determine tunnel interruption to 3 , and the command is?

keepalive 10 3

keepalive 3 10

keepalive-interval 10

keepalive-times 3

112. In the GRE Tunnel interface view, the complete command to configure the tunnel encapsulation mode to GRE is?

tunnel protocol gre

tunnel gre

tunnel-protocol gre

protocol gre

113. In L2TP networking, LNS has three ways to authenticate users: proxy authentication, forced CHAP authentication and LCP renegotiation. The one with the highest priority is?

Agent verification

Force CHAP authentication

LCP renegotiation

All the same

114. In L2TP networking, what are the authentication methods used by LNS for users? (Multiple choice)

Agent verification

Force CHAP authentication

IPCP renegotiation

LCP renegotiation

115. L2TP tunnel information can be displayed through the ____ command.

display 12tp tunnel

display l2tp session

display l2tp status

display 12tp verbos

116. L2TP session information can be displayed through the ____ command.

display 12tp tunnel

display 12tp session

display 12tp status

display 12tp verbose

117. Which of the following statements about the client, LAC and LNS in L2TP is correct? (Multiple choice)

The client can serve as LNS at the same time

A LAC can establish connections with multiple LNS at the same time

The client can also serve as a LAC

LAC can serve as LNS at the same time

118. Which of the following statements about the client, LAC and LNS in L2TP are correct? (Multiple choice)

One LAC can only establish a connection with one LNS at the same time.

A LAC can establish connections with multiple LNS at the same time

The client can also serve as a LAC

The client can serve as LNS at the same time

119. As a client, the PC uses the client LAC mode to establish an L2TP tunnel through the iNode and the LNS. If it prompts that the IP acquisition times out, the possible reason for this problem is?

The username and password on the iNode are incorrect.

Tunnel interface verification fails

IP address pool configuration error

LNS fails LAC authentication

120. In L2TP VPN, LAC (L2TP Access Concentrator, L2TP Access Concentrator) receives the IP data packet sent from the remote system to the server, and needs to encapsulate the data packet accordingly and send it to LNS (L2TP Network Server, L2TP network server), the encapsulation format of the data packets transmitted between LAC and LNS is?

Private network data packet L2TP header, PPP header, UDP header, public network IP header

Private network packet PPP header, UDP header, L2TP header, public network IP header

Private network packet PPP header, L2TP header, UDP header, public network IP header

Private network packet PPP header, UDP header, public network IP header, L2TP header

Page 13 of 13

121. In L2TP networking, the command to configure the forced re-authentication of CHAP between the LNS and the client is?

In the L2TP-group view, configure the command mandator-chap

In global view, configure the command mandator-chap

In L2TP-group view, configure the authentication-mode mandator-chap command

In the L2TP-group view, configure the command mandator chap

122. In L2TP networking, the command to configure LNS to force LCP renegotiation authentication mode for users is?

In L2TP-group view, configure mandator-lcp

In global view, configure manclator-lcp

In L2TP-group view, configure authentication-mode mandator-lcp

In L2TP-group view, configure mandator lcp

123. The main functions of LNS and LAC in the L2TP component are? (Multiple choice)

LNS encapsulates the packets received from the remote system (Remote system) through L2TP and sends them to the LA

LNS and LAC jointly maintain L2TP tunnels

LAC can exist on remote systems

LNS can exist on remote systems

124. The main functions of LNS and LAC in the L2TP component are? (Multiple choice)

The LAC encapsulates the packets received from the remote system through L2TP and sends them to the LN

L2TP tunnels are mainly maintained by LAC

LAC and LNS can be the same device

LAC and LNS are the endpoints of the L2TP session

125. Which of the following descriptions about L2TP tunnel (Tunnel) and L2TP session (Session) are correct? (Multiple choice)

Only one L2TP tunnel can be established between the same pair of LNS and LA

One or more L2TP tunnels can be established between the same pair of LNS and LAC

L2TP sessions can occur before the L2TP tunnel is established

The L2TP session must be conducted after the L2TP tunnel is established.

126. Which of the following descriptions about L2TP tunnel (Tunnel) and L2TP session (Session) are correct? (Multiple choice)

Packets with different session IDs can reuse the same tunnel.

Packets with different session IDs cannot reuse the same tunnel.

L2TP sessions can occur before the L2TP tunnel is established

The L2TP session must be conducted after the L2TP tunnel is established.

127. When the PPP frame is encapsulated by adding an L2TP header, it will be marked with the correct Tunnel ID and Session ID to identify its tunnel and session attributes. The Tunnel ID (tunnel identifier) in this L2TP header is assigned by ____, and the Session ID (session identifier) is assigned by ____.

Local LAC, local LAC

Peer LNS, Peer LNS

Local LAC, peer LNS

Peer LNS, local LAC

GB0-391 Constructing Secure optimized WANs v2.0 Exam Training Material

GB0-391 Constructing Secure optimized WANs v2.0 Exam Training Material

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