Router R1 and Router R2 run BGP. Both routers are in the AS 65234. The route of router R2 exists in the BGP routing table of router R1, but is not in the IP routing table of router R1. So, what caused the problem?

• A.The BGP neighbor relationship is Down.
• B.Routing is not optimal
• C.Synchronization is turned off
• D.Router R1 does not enable BGP Multi-hop

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As shown in the following topology diagram, all the interfaces of the router in the figure are all enabled with the ISIS protocol. The correct statements of the following are: (Multiple Choice)

• A.If the GE0/0/0 interface of R3 is down, then R2 will become the master device.
• B.If the Ethernet 0/0/0 interface of R1 is down, then R2 will become the master device.
• C.If the Ethernet 0/0/0 interface of R3 is down, then R2 will become the master device.
• D.If the Ethernet 0/0/1 interface of R1 is down, then R2 will become the master device.

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The Type 5 LSA in OSPF are used to pass external routes. Which of the following statements about the Type 5 LSA are wrong?

• A.The router in the same area as the ASBR can calculate the external route through the intra-area LSA and the Type 5 LSA.
• B.The FA address is included in the Type 5 LSA, and the FA address is 0.0.0.0, but has no practical effect as a reservation.
• C.Configure the corresponding policies on the ABR and ASBR to filter the Type 5 LSA.
• D.Type 5 LSAs are advertised by the ASBR and flooded in the OSPF network in the non-Stub/NSSA area.

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BGP can only automatically aggregate routes originating from Incomplete.

• A.True
• B.False

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Which of the following descriptions are true about the establishment process of LDP LSP? (Multiple Choice)

• A.In the label publishing DoD mode, for a specific FEC, the LSR does not need to obtain the label request message from the upstream to perform label distribution and distribution.
• B.When the network topology changes cause the next hop neighbor to change, the LSR can directly reestablish the LSP by using the label sent by the original non-optimal next hop neighbor.
• C.The process of establishing an LSP is actually the process of binding the FEC to the label and advertising the binding to the upstream LSR of the LSP.
• D.By default, the LSR is for the same FEC. The received label mapping can only come from the optimal next hop. It cannot be from the non-optimal next hop.

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