单项选择题

TheenablesecretcommandisusedtosecureaccesstowhichCLImode？（）

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

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单项选择题

WhichcommandcanbeusedtoverifytheDLCIdestinationaddressinaFrameRelaystaticconfiguration？（）

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

单项选择题

GivenanIPaddress172.16.28.252withasubnetmaskof255.255.240.0，whatisthecorrectnetworkaddres？（）

A.172.16.16.0
B.176.24.0.0
C.172.16.0.0
D.172.16.28.0