QUESTION: 25

ISIS elects DIS in broadcast multiplexed access networks, and the following statement about DIS is correct?( Multiple choice)

ISIS elects dis by comparing priorities, and mac addresses if the priorities are consistent
In a broadcast multiple access network, DIS sends Hello PDUs at three times the frequency
DIS guarantees database synchronization by periodically sending CSNP messages
DIS supports preemption function, after the new DIS preemption is successful, there is no need to flood any LSP packet

Answer(s): A,B,C

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QUESTION: 26

A switch joins a running stacking system after powering up, a behavior known as heap overlay.

TRUE
FALSE

Answer(s): A

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In order to reduce the number of OSPF routes in certain areas, the OSPf protocol has developed special area functions, and the following description of the characteristics of OSPF special areas is correct