ForaroutertoobtainacertificatefromaCA，whatisthefirststepofthecertificateenrollmentprocess？（）
A. theroutergeneratesacertificaterequestandforwardsittotheCA
B. theroutergeneratesanRSAkeypair
C. theroutersendsitspublickeytotheCA
D. theCAsendsitspublickeytotherouter
E. theCAverifiestheidentityoftherouter
F. theCAgeneratesacertificaterequestandforwardsittotherouter
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WhatistheportnumberofanIPsecEncapsulatingSecurityPayloadpacket？（）
A. IPprotocol50
B. IPprotocol51
C. TCPport50
D. TCPport51
E. UDPport50
F. UDPport51
WhichMQC-basedoutputqueueingmethodisdesignedtosupportmultipletrafficclassesincludingVoIPtraffic，mission-criticaltraffic，bulktraffic，interactivetrafficanddefaultclasstraffic？（）
A. CustomQueueing
B. CB-WRED
C. WRRQueueing
D. LLQ
E. CBWFQ
InPPPoAarchitecture，whichtwomethodsaremostcommonlydeployed？（）
A. terminatingPPPsessionsattheserviceprovider
B. PPPframing
C. PPPmultiplexing
D. GREtunneling
E. L2TPtunneling
TACACS+authenticationuseswhichthreepackettypes？（）
ACCESSREQUEST
B. ACCESSACCEPT
CONTINUE
D. CHALLENGE
E. REPLY
F. START
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