Regarding sham link, which of the following description is wrong?

• A.The endpoint address of the sham link is advertised as a VPhv4 address by BGP. Routes that have passed sam1ik can also be imported into BGP in the form of VPNv4 routes
• B.In order to forward the VPN flow through the MPLS backbone network, the routing cost of the sham link should be less than the OSPF routing cost of the backdoor road
• C.The 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
• D.The sham link is 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 32-bit mask in the VPN address space on the PE router. interface address

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Which of the following statement is wrong?

• A.LSPs established by statically assigning labels can also be dynamically adjusted according to changes in the network topology, without administrator intervention
• B.The principle to be followed for manual label allocation is: the value of the outgoing label of the upstream node is the value of the incoming label of the downstream node
• C.Dynamic LSP is dynamically established through label distribution protocols, such as MP-BGP, RSVP-TE, LDP
• D.LSP is divided into static LSP and dynamic LSP. The static LSP is manually configured by the administrator, and the dynamic LSP is dynamically established using the label protocol

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As shown in the figure, all routers run OSPF, because R3 is in the backbone area, so in the LSDB of R3 There are no three types of LSAO

• A.False
• B.True

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As shown in the figure, the cost value of the link that all interfaces of the router enable DSPF is identified in the figure.

The Loopback D interface of R2 is advertised in area 1. Then the cost value of R1 to 10.2/32 is:

• A.50
• B.150
• C.200
• D.100

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Which of the following functions will affect the establishment of BGP neighbors? (Multiple choice)

• A.BGP route filtering
• B.BGP GSTM
• C.ebgp max hop
• D.BGP authentication

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