WhichthreearecharacteristicsofanIPV6anycastaddress?（）
A. any-to-manycommunicationmodel
B. deliveryofpacketstothegroupinterfacethatisclosesttothesendingdevice
C. one-to-manycommunicationmodel
D. thesameaddressformultipledevicesinthegroup
E. one-to-nearestcommunicationmodel
F. auniqueIPV6addressforeachdeviceinthegroup
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列车有不法小商贩兜售餐饮食品或其它物品，属于（）问题。
A. 红线
B. A1
C. A2
D. B
Threeswitchesareconnectedtooneantherviatrunkports.Assumingthedefaultswitchconfiguration,whichswitchiselectedastherootbridgeforthespanning-treeinstanceofvlan1?（）
A. theswitchwiththelowestMACaddress
B. theswitchwiththehigestMACaddress
C. theswitchwitchthehigestIPaddress
D. theswitchwiththelowestIPaddress
如图，如果所有的链接都运行在相同的带宽，哪些端口会被STP指定的端口？（）
A. Switch A - Fa0/0
B. Switch A - Fa0/1
C. Switch B - Fa0/0
D. Switch B - Fa0/1
E. Switch C - Fa0/0
F. Switch C - Fa0/1
发生旅客跳车、自杀等严重伤害事件，属于（）问题。
A. 红线
B. A1
C. A2
D. B
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