单项选择题

Auserhasasmallnetworkoffourcomputersthattheywanttoconnecttoasinglecablemodem.Whichofthefollowingdeviceswouldallowtheusertodothis？（）

A.Fourportswitch
B.Fourportwirelessrouter
C.FourportWAP
D.Fourporthub
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单项选择题
WhichofthefollowingnetworkdevicesoperatesonLayer1oftheOSImodel？（）
A.Hub
B.Switch
C.Router
D.Bridge
单项选择题
WhichofthefollowingisthedefinitionofCASlatency？（）
A.CASlatencyistheratiobetweenthecolumnaccesstimeandtheclockcycletime.
B.CASlatencyistheratiobetweentherowaccesstimeandtheclockcycletime.
C.CASlatencyistheratiobetweenthecolumnaccesstimeandthedatabursttransfertime.
D.CASlatencyistheratiobetweentherowaccesstimeandthedatabursttransfertime.
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