单项选择题
A.Four port switch
B.Four port wireless router
C.Four port WAP
D.Four port hub
单项选择题 Auserstatesthattheycannotaccessanetworkshareddrive.Thetechnicianhasverifiedthattheclientsnetworkcableisgood.TheIPaddressofthemachineis169.254.10.15.Whichofthefollowingisthecauseoftheproblem？（）
单项选择题 EnsuringthatdataistransmittedsecurelyoveranIPnetworkisthemainpurposeof：（）
单项选择题 WhichofthefollowingisSTPBESTidentifiedbyunderthecablesheath？（）