单项选择题
Which of the following network devices operates on Layer 1 of the OSI model？（）
A.Hub
B.Switch
C.Router
D.Bridge
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Anetworktechnicianisinstallingaseriesofthreeaccesspointstocovertheentirewingofabuilding.Eachaccesspointhasawiredconnectionand802.11gisbeingusedforthewirelesstransmission.Whichofthefollowingchannelsshouldbeusedfortheaccesspoints？（）
A.Channels 1-6-11
B.Channels 1-3-5
C.Channels 7-11-1
D.Channels 2-4-6 -
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Atechniciannoticesthatwhentryingtopingaworkstationbynetworknametheworkstationdoesnotreplybackoverthenetwork.TheworkstationispartofthedomainandisabletogettotheInternet.Whichofthefollowingisthecauseoftheproblem？（）
A.Faulty cable on the workstation
B.Wrong host name on the workstation
C.Wrong WINS on the workstation
D.Incorrect IP address assigned to the workstation -
单项选择题
Asecondnetworkcardinaserverthatactivatesiftheprimarycardfailsisanexampleofwhichofthefollowingnetworkperformanceoptimization？（）
A.Load balancing
B.QoS
C.High availability
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