单项选择题
A. Only use fiber in pairs.
B. Configure root guard on your switches.
C. Do not use fiber but use copper.
D. Configure UDLD to prevent one-way link conditions.
单项选择题 WhichfeaturewouldpreventguestusersfromgainingnetworkaccessbyunplugginganIPphoneandconnectingalaptopcomputer？（）
多项选择题 Refertotheexhibit.TherearetwositesconnectedacrossWANlinks.Allintersiteandintrasitelinksalwayshavethesameroutingmetric.ThenetworkadministratorseesonlythetoproutersandlinksbeingusedbyhostsatbothLANAandLANB.Whatwouldbetwosuggestionstoload-balancethetrafficacrossbothWANlinks？（）
多项选择题 Yournetworkissufferingfromregularoutages.Aftertroubleshooting，youlearnthatthetransmitleadofafiberuplinkwasdamaged.Whichtwofeaturescanpreventthesameissuesinthefuture？（）