ISIS protocol in broadcast network and P2P network, when router receives LSP, it needs to use PSNP confirms to ensure the synchronization of LSDB.

• A.false
• B.True

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the following about what is wrong with the description of MPLS BGP VPN?

• A.The TTL field in the label has the effect of preventing loops.
• B.Generally, loopback interface addresses are used to establish stable BGP neighbor relationships between IBGP PEs.
• C.BGP SoO is used to prevent from a VPThe route advertised by site N returns to this site through the MPLS backbone network. SoO is an extended community attribute automatically generated by MP-BGP.
• D.PE-The route exchange between CEs can use static routes, OSPF multi-instance, IS-IS multi-instance, and EBGP.

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

• A.Sham link can be advertised in any area, it needs to be configured manually, and the local VPN instance must have a route to the destination address of the sham link (the sham link endpoint address of the peer PE)
• B.The endpoint address of the Sham link is published by BGP as the VPNv4 address. Routes that have passed through the sham link can also be imported into BGP in the form of VPNv4 routes.
• C.Sham link is regarded as a link between two VPI instances, each VPN instance must have an endpoint address of sham1irk, which must be a Loopback interface with a 32-bit mask in the VPN address space on the PE router address
• D.In order to forward VPN traffic through the MPLS backbone network, the routing cost of the sham link should be less than the OSPF routing cost of the backdoor link

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The CSNP packets of ISIS and the DD packets of OSPF are both used in the MA network to describe the summary of the link state database.Which statements are correct

• A.Both types of packets need to be confirmed by the peer router after they are sent, otherwise they will need to be retransmitted.
• B.Once the adjacency is established successfully, CSNP packets and DD packets will stop sending
• C.Both types of packets do not need to be confirmed by the peer router after they are sent.
• D.OSPThe master-slave relationship in the DD packet interaction of F has no identity binding with DR/BDR; while CSNP packets are only generated by DIS

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The following description of Link ID, Data, Type and Metirc in Router-LSA is correct.

• A.and Data are used to describe the additional information of this connection. The information described by different connection types is also different.
• B.Metric describes the cost of this connection
• C.Type indicates the type of connection
• D.Link ID represents the local identification of this connection, and different connection types have different meanings of Link ID.

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