Firewallfilterscanbeusedtoaccept,discard,orrejectpacketsbasedon（）
A. protocoltype
B. MACaddress
C. TCPorUDPport
D. sourceanddestinationIPaddress
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网络信息资源按加工层次可以分为了（）
A. 网络二次信息
B. 网络四次信息
C. 网络零次信息
D. 网络一次信息
E. 网络三次信息
F. 网络五次信息
WhichthreestepsarepartofthePPPCHAP3-wayhandshake?（）
A. Thecallersendsachallengetotheauthenticator.
B. Theauthenticatorsendsachallengetothecaller.
C. Thecallerencryptsthechallengeusingasecret.
D. Thecallersendsasuccessmessagetotheauthenticator.
E. Theauthenticatorencryptsthechallengeusingasecret.
Afirewallfilterisappliedasaninputfilteronatransitinterface.Whatthreetypesoftrafficwillthisaffect?（）
A. inboundtraffictransitingtherouter
B. outboundtraffictransitingtherouter
C. trafficdestinedtotheRoutingEngine
D. trafficdestinedtotheinterfaceaddressonwhichthefilterisapplied
WhichprocessoccursfirstduringtheEthernetDiscoveryStageprocessforaPPPoEserviceoffering?（）
A. TheERXroutersendsanActiveDiscoveryOffermessage.
B. TheERXroutersendsanActiveDiscoveryInitiationmessage.
C. ThecustomerdevicesendsanActiveDiscoveryOffermessage.
D. ThecustomerdevicesendsanActiveDiscoveryInitiationmessage.
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