Which of the following statements regarding the LSA age field are true?

• A.If the LS age of a LSA has reached the LSRefreshTime (30 minutes), the originator of this LSA needs to regenerate an instance of this LSA again.
• B.The unit of this field is seconds. In a LSDB, the LS age of a LSA increases with time.
• C.The unit of this field is seconds. In a LSDB, the LS age of a LSA decreases with time.
• D.If the LS age of a LSA has reached the LSRefreshTime (30 minutes), any router can regenerate an instance of this LSA again.

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Which of the following statements about stack splitting is incorrect?

• A.Multiple stack systems after splitting will have the same IP address and MAC address. To avoid causing network failures, the stack will perform MAD detection.
  The party that fails the MAD detection competition will close all physical ports except reserved ports.
• B.If the master and slave switches are still in the same stack system after the stack splits, the slave switch separated from the original master and slave switches will re-elect the master and slave switch due to protocol packet timeout.
• C.After the stack is split, the MAC addresses of the two stack systems will change immediately.
• D.If the primary switch is in two stacking systems after the stack is split, the stack system where the original master switch is located updates the topology, reassigns the primary switch, and the original standby switch is promoted to the primary switch in the new stack system, and a new standby switch is elected at the same time

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By default, how many seconds is the BCP peer adjacency relationship maintained?

• A.60 seconds
• B.120 seconds
• C.180 seconds
• D.10 seconds

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Which of the following description about BGP, OSPF, ISIS is correct?

• A.ISIS runs based on the IP protocol, using the protocol number 89
• B.OSPF runs based on the IP protocol, and the protocol number used is 90
• C.BGP runs based on UDP sessions, and the port number used is 179
• D.The BGP neighbor relationship is established based on TCP sessions, and the port number used is 179

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After a BGP peer relationship is established between two ends, changing the router ID of one end resets the BGP peer relationship.

• A.TRUE
• B.FALSE

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