单项选择题
A.77.0.5.5
B.40.40.0.254
C.66.40.90.121
D.72.40.91.1
多项选择题 WhichofthefollowingareformsofgigabitEthernetthatrequiretheuseoffiberopticcables？（）
单项选择题 WhichofthefollowingnetworkdevicesoperatesonLayer1oftheOSImodel？（）
单项选择题 Anetworktechnicianisinstallingaseriesofthreeaccesspointstocovertheentirewingofabuilding.Eachaccesspointhasawiredconnectionand802.11gisbeingusedforthewirelesstransmission.Whichofthefollowingchannelsshouldbeusedfortheaccesspoints？（）
