Among the following types of LSA, the ones allowed in the backbone area are _________

• A.Tpe4 LSA
• B.Tpe3 LSA
• C.Tpe7 LSA
• D.Tpe5 LSA

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As shown in the figure, RTA, RTB, and RTC are located in AS100, AS200, and AS300 respectively. Users do not want AS 100 to transfer the traffic between AS200 and AS300. The best way to achieve this requirement is:

• A.Define AS_PATH List on RTA and apply it to the outgoing direction of EBGP neighbors on RTA. ip as-path 1 den^200_300$ ip as-pth 1 permit
• B.Define AS_PATH List on RTA and apply it to the outgoing direction of EBGP neighbors on RTA. ip as-path 1 den^200$ ip as-path 1 den^300$ ip as-path 1 permit
• C.Define AS_PATH List on RTA and apply it to the outgoing direction of EBGP neighbors on RTA. ip as-path 1 den^200$ ip as-path 1 den^300$ ip as-pth 1 permit
• D.Configure access control on the interconnection interface between RTA and RTB and RTC, and mutual access between AS 200 and 300 is not allowed.

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About the difference between system policy routing and interface policy routing. The correct statement is _________

• A.System policy routing works on both locally generated and forwarded packets
• B.Interface policy routing works on both locally generated packets and forwarded packets
• C.System policy routing only affects local messages, and does not affect forwarded messages
• D.Interface policy routing only affects forwarded packets, and does not affect locally generated packets

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A local area network has been running for 1 year (8,760 hours), and it has been out of service for 8 hours due to equipment failure. Later, after the network was expanded and new equipment was added, it ran for another year, and was out of service for another 3 hours due to a software failure.
Regarding the availability of this network (Availabilit), which of the following statements are correct?

• A.The availability of the network after the expansion is worse than before the expansion
• B.Before expansion, network availability was 99.91%
• C.From the beginning of the network to the present, its availability is 99.96%
• D.The availability of the network after the expansion is better than before the expansion

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L is a network design engineer. In a certain network project, in order to reduce the complexity, the small L design network adopts a two-layer architecture, and the access layer functions are incorporated into the convergence layer. In the design, the small L takes into account that the core layer needs to have a fast convergence function, and the convergence layer performs route aggregation to reduce the number of routes. Among the following routing protocols, which one should be used as the core layer routing protocol?

• A.RIP
• B.OSPF
• C.IS-IS
• D.BGP

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