Which of the following description is true about the OSPF virtual link?

• A.The virtual link uses the outbound interface P as the link address.
• B.The virtual link can be used to solve the problem that area 0 is divided.
• C.The cost of the virtual link is 0, it is the optimal link.
• D.A virtual connection can be established in any area, and it belongs to the area itself after it is established.

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The following statement about the NSSA area, which is correct.

• A.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.
• B.In the OSPF neighbor relationship sent by the OSPF neighbor, the N position in the option field is set to 1. The E position is 0.
• C.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.
• D.A default LSA must be automatically generated in the NSSA area to access the external network.

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When there are multiple matching rules in the ACL of the VRP, which of the following statements is correct about the matching order?

• A.There is only one matching order and cannot be modified.
• B.On confirmation, follow the Rule-ID, match from small to large
• C.On confirmation, match the order by matching the permit first and then matching the deny.
• D.By default, match according to the principle of "depth first"

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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 compare- different-as-med in the BGP process of R1.
• B.Configure deterministic-med in the BGP process of R1.
• C.Configure compare- different-as-med in the BGP process of R2.
• D.Configure deterministic-med in the BGP process of R2.

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Which of the following statements are wrong about cross-domain MPLS VPN? (Multiple Choice)

• A.For the cross-domain VPN-OptionB mode, the two ASBRs are connected to each other through multiple interfaces (including sub-interfaces). Each interface is associated with a VPN. Each ASBR-PE treats the peer as a CE.
• B.For cross-domain VPN-Option B mode, an MP-EBGP neighbor relationship needs to be established between the two ASBRs.
• C.When the public network label is LDP-based, the Layer 3 label is required for the cross-domain VPN-OptionC scheme 2 packet forwarding process.
• D.For the cross-domain VPN Option A mode, the route between the two ASBRs is a normal PV4 route.

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