单项选择题
A.point-to-point and multiaccess
B.point-to-multipoint and multiaccess
C.point-to-point and point-to-multipoint
D.nonbroadcast and broadcast multipoint
E.nonbroadcast and broadcast multiaccess
单项选择题 Whywouldanetworkadministratorconfigureportsecurityonaswitch?（）
单项选择题 Whatistheeffectofthefollowingaccesslistcondition?access-list101permitip10.25.30.00.0.0.255any（）。
单项选择题 Anetworkadministratorneedstoforceahigh-performanceswitchthatislocatedintheMDFtobecometherootbridgeforaredundantpathswitchednetwork.Whatcanbedonetoensurethatthisswitchassumestheroleasrootbridge?（）