单项选择题

WhichcommandenablesIPv6forwardingonaciscorouter？（）

A.ipv6host
B.ipv6unicast-routing
C.ipv6local
D.ipv6neighbor

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单项选择题

Examinethefollowingoptions，whichSpanningTreeProtocol（STP）protectionmechanismdisablesaswitchportiftheportreceivesaBridgeProtocolDataUnit（BPDU）？（）

A.Uplink
B.Port
C.BPDUGuard
D.RootGuard

单项选择题

WhatisonereasonthatWPAencryptionispreferredoverWEP?（）

A.AWPAkeyislongerandrequiresmorespecialcharactersthantheWEPkey.
B.TheaccesspointandtheclientaremanuallyconfiguredwithdifferentWPAkeyvalues.
C.WPAkeyvaluesremainthesameuntiltheclientconfigurationischanged.
D.ThevaluesofWPAkeyscanchangedynamicallywhilethesystemisused.