Which of the following understanding of DR/BDR is wrong? (Multiple choice)

• A.In a broadcast network, DR and BDR must be elected. Without either DR or BDR, the broadcast network cannot work properly
• B.All DR other only establish adjacency with DR and BDR
• C.The network address monitored by DR other is 2240.0.6
• D.The multicast address that DR other monitors is 224.0.0.5

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Which of the following descriptions about OSPF virtual connections is wrong?

• A.The virtual connection is actually a logical channel
• B.The area through which the virtual connection is configured must have all the routing information
• C.The virtual link must be configured in two ASBRs
• D.Virtual connections increase the complexity of the network

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The Next_Hop attribute in BGP records the next hop of a route. Similar to the next hop in an IGP, the Next_Hop attribute in BGP must be the IP address of a peer interface.

• A.TRUE
• B.FALSE

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Which of the following descriptions about LSDB synchronization is wrong?

• A.In the Loading state, neighbors will send LSR packets, LSU packets, and LSAck packets to each other
• B.LSR does not carry detailed link state information
• C.Detailed LSA information will interact between the ExStart and Loading states
• D.The DD message will carry the summary information of the link state in the Exchange state

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Which of the following descriptions of the characteristics of high-availability networks are correct? (Multiple choice)

• A.Once a failure occurs, business can only be restored through manual intervention.
• B.Can recover quickly after failure
• C.Avoid frequent failures
• D.There will be no malfunction

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