A company has built an OSPF network as shown in the following figure. The links form an OSPF neighbor relationship. All devices have announced their own loopback address. On one day, the S1-R2 and S2-R1 links are faulty. Which of the following description is correct? (Area 0 is split) (Multiple choice)

• A.R5 can learn the loopback route of R2 normally.
• B.R3 cannot learn the loopback route of R2.
• C.R1 can learn the loopback route of R2 normally.
• D.R3 can learn the loopback route of R2 normally.

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As shown in the figure, R1 and R2 are PPP links, and the direct connection ports are not on the same network segment, but the R1 and R2 direct connection ports can communicate, and the Ethernet link cannot communicate under the same IP planning.what are the reasons? (Multiple Choice)

• A.R1 and R2 are connected to the POS port, and the 24-bit subnet route of the direct connection port of the other party is learned through IPCP.
• B.R1 and R2 are connected to the POS port, and the 32-bit host route of the direct connection port of the other party is learned through IPCP.
• C.The data packets of the interconnected POS interface of R1 and R2 do not need to encapsulate the Ethernet header, and do not need to use ARP to request the MAC address.
• D.The interconnected POS port of R1 and R2 learns the MAC address of the peer interface through LCP, and does not require the ARP request MAC address.

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In the process of using the LACP protocol, which of the following description is correct? (Multiple choice)

• A.You can remove a member interface in an enabled link aggregation group by using the following command: interface Gigabitethemnet0/0/0 shutdown interface Gigabitethernet0/0/1 undo eth-trunk 1 interface Gigabitetheret0/0/ undo shutdown
• B.You can configure the source IP address for load balancing in the enabled link aggregation group by using the following command: interface eth-trunk 1 load-balance src-dst-ip
• C.You can add member interfaces to the enabled link aggregation group by using the following command: interface Gigabitethernet0/0/1 shutdown interface Gigabitethernet0/0/1 trunkport Gigabitethernet0/0/ interface Gigabitethernet0/0/1 undo shutdown
• D.You can prevent the Eth-Trunk interface from frequently oscillating due to physical link by using the following command: interface eth-trunk 1 lacp preempt enable lacp preempt delay delay-time

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As shown in the following topology figure, the corresponding peer relationship is established. The AS400 receives the 1.1.1.1/32 network route from the AS100. What is the AS-Path attribute?

• A.100 200 300
• B.100 200 300 400
• C.300 200 100
• D.400 300 200 100

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Which of the following is true about the ISIS LSP fragmentation extension?

• A.Enable the ISIS router to generate more LSP fragments to carry more ISIS information.
• B.The maximum number of fragments that ISIS router can generate is 1024.
• C.ISIS fragmentation extensions are achieved by adding virtual systems, which can be expanded to a maximum of 1000 virtual systems.
• D.ISIS fragmentation extensions are equally valid for Hello packets.

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