单项选择题

Whichstatementregarding802.1Xistrue?（）

A.802.1Xissimpletoimplementonanyworkstation.
B.802.1Xrequiresaccess-liststoallowIPvoicetrafficacross.
C.AuthenticationisinitiatedwhentheworkstationconnectstoanEthernetport.
D.802.1XrequiresHTTPaccesstoinitiateauthentication.

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AnEnterprisedecidestoimplementAuthenticationProxyforper－userauthenticationforhomeoffices.EachhomeofficealsosupportsanIPPhone.Whatshouldyoudo?（）

A.ConfigureAccessControlListstoensureVoiceoverIPtrafficischeckedbyAuthProxy.
B.ConfigurepNATtoensureVoiceoverIPpacketsareproperlytranslated.
C.ConfigureIOSfirewalltopermitRTPportnumbersthroughthefirewallviaVPN.
D.ConfigureAccessControlListstoallowVoiceoverIPtraffictobypassAuthProxychecking.

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InaTeleworkerdeploymentwithasingleIPphoneconnectedtoaCisco831router,selectthetruestatementregardingCallAdmissionControl.（）

A.RSVPisarequiredconfigurationtosupportconferencecallswithoutvoicepacketloss.
B.TheQoSconfigurationonthe831routermustalwaysprovisionsufficientbandwidthfortwoRTPstreams.
C.CalladmissioncontrolisanissueonlywhenusinghardwareDSPresources.
D.Whenusingtheconferencecallfeaturesona7960IPphone,onlyoneRTPstreamispresentregardlessofhowmanyextensionsareontheconference.