单项选择题

Whichonesarethetwotypeofciphers？（）

A.Blockingcipherandnon-blockingcipher
B.CBCcipherandEBCcipher
C.BlockcipherandStreamcipher
D.BlockercipherandStreamercipher
E.3DEScipherandAEScipher

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单项选择题

ForaroutertoobtainacertificatefromaCA，whatisthefirststepofthecertificateenrollmentprocess？（）

A.theroutergeneratesacertificaterequestandforwardsittotheCA
B.theroutergeneratesanRSAkeypair
C.theroutersendsitspublickeytotheCA
D.theCAsendsitspublickeytotherouter
E.theCAverifiestheidentityoftherouter
F.theCAgeneratesacertificaterequestandforwardsittotherouter

单项选择题

WhatistheportnumberofanIPsecEncapsulatingSecurityPayloadpacket？（）

A.IPprotocol50
B.IPprotocol51
C.TCPport50
D.TCPport51
E.UDPport50
F.UDPport51