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質問 1：
In an MPLS IBGP VPN environment, if LDP distributes labels only through BGP, the MPLS labels of the packets are at most two layers.
A. False
B. True
正解：B
質問 2：
In addition to stateless address autoconfiguration, IPv6 devices can also obtain information such as addresses, gateways, and DNS through DHCPv6.
A. False
B. True
正解：A
質問 3：
View the details of all VPN instances on a network device. The results are as follows. Which of the following statements are incorrect? (Multiple Choice)
A. VPN-Instance vpna will not receive VPN routes with RT 2:1
B. The total number of instances of the IPv6 address cluster enabled in the VPN configured on the local end is 1.
C. GigabitEthernet 1/0/0 interface is bound to the VPN-Instance vpna.
D. The device will assign a label to each route of the VPN-Instance vpna.
正解：B,D
質問 4：
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
A. Configure deterministic-med in the BGP process of R1.
B. Configure deterministic-med in the BGP process of R2.
C. Configure compare- different-as-med in the BGP process of R2.
D. Configure compare- different-as-med in the BGP process of R1.
正解：D
質問 5：
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 above requirements?
A. AH+ transmission mode
B. None of the above options
C. ESP+ tunnel mode
D. AH+ tunnel mode
正解：C
質問 6：
Which of the following is the correct description of the route priority for ISIS?
A. ISIS aggregated route has a priority of 10
B. The routing priority of ISIS cannot be modified.
C. The default route of ISIS priority is 15.
D. The LeveI-1 and Leve-2 routes in the ISIS database have different routing priorities.
正解：C
質問 7：
Regarding the BGP anti-ring mechanism, which of the following description is correct? (Multiple choice)
A. 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.
B. Use the AS-PATH attribute between the autonomous systems to prevent loops.
C. Routes learned from IBGP are not advertised to IBGP neighbors. They are used to prevent routing loops within the AS.
D. The AS-CONFED-SET attribute can be used to prevent loops within the confederation.
正解：B,C,D
質問 8：
About the description of CHAP authentication function in the PPP protocol, which of the following are correct? (Multiple Choice)
A. If the authenticator does not have a username, the password cannot be configured on the authenticated interface.
B. The user name must be configured under the authenticated interface of CHAP authentication.
C. Three-message interactive authentication is required, and the username is transmitted only on the network without transmitting the password.
D. Calculate a hash value using the authentication sequence ID, random number, and key by the MD5 algorithm
正解：B,C,D
In an MPLS IBGP VPN environment, if LDP distributes labels only through BGP, the MPLS labels of the packets are at most two layers.
A. False
B. True
正解：B
質問 2：
In addition to stateless address autoconfiguration, IPv6 devices can also obtain information such as addresses, gateways, and DNS through DHCPv6.
A. False
B. True
正解：A
質問 3：
View the details of all VPN instances on a network device. The results are as follows. Which of the following statements are incorrect? (Multiple Choice)
A. VPN-Instance vpna will not receive VPN routes with RT 2:1
B. The total number of instances of the IPv6 address cluster enabled in the VPN configured on the local end is 1.
C. GigabitEthernet 1/0/0 interface is bound to the VPN-Instance vpna.
D. The device will assign a label to each route of the VPN-Instance vpna.
正解：B,D
質問 4：
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
A. Configure deterministic-med in the BGP process of R1.
B. Configure deterministic-med in the BGP process of R2.
C. Configure compare- different-as-med in the BGP process of R2.
D. Configure compare- different-as-med in the BGP process of R1.
正解：D
質問 5：
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 above requirements?
A. AH+ transmission mode
B. None of the above options
C. ESP+ tunnel mode
D. AH+ tunnel mode
正解：C
質問 6：
Which of the following is the correct description of the route priority for ISIS?
A. ISIS aggregated route has a priority of 10
B. The routing priority of ISIS cannot be modified.
C. The default route of ISIS priority is 15.
D. The LeveI-1 and Leve-2 routes in the ISIS database have different routing priorities.
正解：C
質問 7：
Regarding the BGP anti-ring mechanism, which of the following description is correct? (Multiple choice)
A. 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.
B. Use the AS-PATH attribute between the autonomous systems to prevent loops.
C. Routes learned from IBGP are not advertised to IBGP neighbors. They are used to prevent routing loops within the AS.
D. The AS-CONFED-SET attribute can be used to prevent loops within the confederation.
正解：B,C,D
質問 8：
About the description of CHAP authentication function in the PPP protocol, which of the following are correct? (Multiple Choice)
A. If the authenticator does not have a username, the password cannot be configured on the authenticated interface.
B. The user name must be configured under the authenticated interface of CHAP authentication.
C. Three-message interactive authentication is required, and the username is transmitted only on the network without transmitting the password.
D. Calculate a hash value using the authentication sequence ID, random number, and key by the MD5 algorithm
正解：B,C,D
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