单项选择题

Areceivinghostcomputesthechecksumonaframeanddeterminesthattheframeisdamaged.Theframeisthendiscarded.AtwhichOSIlayerdidthishappen？（）

A.session
B.network
C.physical
D.datalink
E.transport

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单项选择题

TheenablesecretcommandisusedtosecureaccesstowhichCLImode？（）

A.userEXECmode
B.globalconfigurationmode
C.privilegedEXECmode
D.auxiliarysetupmode

单项选择题

WhichcommandcanbeusedtoverifytheDLCIdestinationaddressinaFrameRelaystaticconfiguration？（）

A.showframe-relayend-to-end
B.showframe-relaymap
C.showframe-relaylmi
D.showframe-relaypvc