What are the wrong statements about OSPF's Router LSA and Network LSA?

• A.runOSPFThe router must generateRouter LSA
• B.OSPFmust exist in the networkRouter LSAandNetwork LSA
• C.Network LSA, Carry both topology and routing information
• D.runDSPFThe router must generateNetwork LSA

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Regarding the cause of the dual-master failure of the VRRP backup group, which of the following is the most unlikely?

• A.The link that transmits the VRRP notification message is faulty
• B.Master device sends 1 notification message per second
• C.The VRRP backup group IDs on both ends are different
• D.The low-priority VRRP backup group discards the received VRRP notification packets as illegal packets

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The Router LSA of a router is shown in the figure. Which of the following statements is wrong?

• A.This router has established an adjacency relationship
• B.This router supports external route import
• C.of this routerRouter IDfor10.0.12.1
• D.This router isDR

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As shown in the figure:

• A.There is Type 5 LSA flooding in Area1
• B.There is no Type3 LSA flooding in Area1
• C.There is no Type 3 LSA flooding in Area2
• D.There is Type 5 LSA flooding in Area2

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The Discovery message of LDP is used for neighbor discovery, and LDP has different discovery mechanisms when discovering neighbors. Then, which of the following statements about Discovery message in the basic discovery mechanism is correct? (Multiple choice)

• A.The destination IP address of the message is the multicast IP address 224.0.0.2
• B.After the TCP connection is established, the LSR does not continue to send Hello Message
• C.The message is sent to the designated LDP Peer
• D.This message is encapsulated in a UDP message, and the destination port number is 646

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