What are two rules for compacting IPv6 addresses？（）
A. The maximum number of times a double colon can replace a 16-bit segment that consists of all zeroes is two
B. The leading zeroes in any 16-bit segment do not have to be written.
C. Every 16-bit segment that consists of all zeroes can be represented with a single colon
D. The trailing zeroes in any 16-bit segment do not have to be written.
E. Any single， continuous string of one or more 16-bit segments that consists of all zeroes can be represented with a double colon
F. Two zeroes in the middle of any 16-bit segment do not have to be written
Refer to the exhibit. Which two statements are correct regarding the creation of a multicastdistribution tree？ （）
A. Each router determines where to send the JOIN request.
B. The tree will be built based on the IP address of the E2 interface on router E
C. The best path to the source will be discovered in the unicast routing table on router B
D. The best path to the source will be discovered in the unicast routing table on router C
E. The best path to the source will be discovered in the unicast routing table on router E
流感的确诊的主要依据是（）
A. 发病季节
B. 呼吸道症状轻微而全身中毒症状重
C. 病毒分离
D. 流行规模
Refertotheexhibit.Whichrecommendedpracticeisapplicable?（）
A. Ifnocorelayerisdeployed,thedesignwillbeeasiertoscale.
B. Ifnocorelayerisdeployed,therewillbefewercablingrequirements.
C. Ifnocorelayerisdeployed,thedistributionswitchesshouldnotbefullymeshed.
D. Adedicatedcampuscorelayerisnotneededforconnectingfewerthanfivebuildings.
E. Adedicatedcampuscorelayershouldbedeployedforconnectingthreeormorebuildings.
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