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

• A.MPLS LDP
• B.BGP
• C.Static routing
• D.OSPF

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In the broadcast network and the P2P network, when the router receives the LSP, it needs to use the PSNP to confirm the LSDB.

• A.True
• B.False

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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.

• A.True
• B.False

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Which of the following statements about the IS-IS route summary is correct?

• A.Route aggregation only takes effect on LeveI-1 router
• B.You can configure route aggregation and take effect on all types of routers.
• C.Route aggregation only takes effect on the LeveI-1-2 router
• D.Route summarization only takes effect on the Leve-2 router

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As shown in the configuration, if the administrator configures OSPF on R1 but R1 cannot learn the routes of other routers, the possible reason is (). (Multiple choice)
[R1]ospf [Rl-ospf-1]area 2 [R1-ospf-1-area-0.0.0.2]network 10.0.13.1 0.0.0.0

• A.This router is not configured with an OSPF process ID.
• B.The router's announcement network address does not match the interface mask.
• C.Area ID configured by the router and area ID of its neighboring router is different.
• D.This router is not configured with authentication, but the neighbor router is configured with authentication.

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