单项选择题

WhatisonereasonthatWPAencryptionispreferredoverWEP?（）

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

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单项选择题

BeforeaDiffie－Hellmanexchangemaybegin，thetwopartiesinvolvedmustagreeonwhat？（）

A.Twosecretkeys
B.Twononsecretkeys
C.Twosecretnumbers
D.Twononsecretnumbers

单项选择题

IfanethernetportonarouterwasassignedanIPaddressof172.16.112.1／20,whatisthemaximumnumberofhostsallowedonthissubnet?（）

A.1024
B.2046
C.4094
D.4096
E.8190