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.
（）是研究变量之间的数量伴随关系，并通过样本数据建立变量间的数学关系式。
A. 回归分析
B. 相关分析
C. 方差分析
D. 指数分析
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