As shown in the figure, an engineer uses 4 routers to test branch network interoperability. Among them, R1, R2, and R3 in branch 1 deploy OSPF to realize network interoperability, and R2, R3, and R4 in branch 2 deploy IS-IS to realize network interoperability. Intercommunication. Now the engineer wants to implement R1 to access the loopback port address of R4. Which of the following operations can satisfy the meet this need?

• A.only in R2 During the IS-IS process, the default route is advertised
• B.only at In the OSPF process of R2, the default route is advertised
• C.existR2 OSPF Process and IS-IS During the process, the default route is advertised separately
• D.No configuration required

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The following is about cross-domain VPN-Option The characteristics of C, the description is correct?

• A.A maximum of two layers of labels are required during packet forwarding.
• B.The ASBRs do not store VPNv4 routes, nor do they advertise VPNv4 routes to each other.
• C.VPN routes are directly exchanged between ingress PEs and egress PEs, without the need for intermediate devices to store and advertise VPN routes.
• D.Cross-domain VPN-Option The C method is not suitable for use when spanning multiple ASs.

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Which of the following descriptions about ISIS' LSP fragmentation extension is correct??

• A.Make ISIS routers generate more LSP fragments to carry more ISISinformation.
• B.ISIS's shard extension pairThe Hello package works just as well.
• C.ISIS score Slice expansion is achieved by adding virtual systems, which can be extended to 1000 virtual systems at most.
• D.ISISroad The maximum number of shards that the router can generate is 1024.

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When you troubleshoot a LAN with Huawei equipment deployed, you find that there are a large number of unicast frames with unknown source MAC addresses in the LAN. A large number of unknown source MAC address unicast frames will cause the greatest harm to the switch?

• A.OccupyTCAM entry
• B.Occupies memory for cached frames
• C.consume available bandwidth
• D.Increase the power consumption of the power supply
• E.Consume MAC address entries available in the system

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What are the reasons for the impossibility of the BGP connection being established and then going down?

• A.Open packet negotiation failed.
• B.After the BGP connection is established, the keepalive is not received within the negotiated holdtimemessage.
• C.An incorrect BGP packet was received.
• D.The mandatory attribute in the routing update packet is missing.

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