Whataretheheadersizesforpoint-to-pointandmulti-pointGRE（alsoknownasmGRE）withtunnelkey？（）
A. 4bytesforboth
B. 4bytes，and8bytesrespectively
C. 8bytesforboth
D. 24bytesforboth
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SNMPv3authorizesmanagementoperationsonlybyconfiguredusersandencryptsSNMPmessages.WhichauthenticationprotocolsdoesCiscoNX-OSSoftwareuseforSNMPv3？（）
A. NMAC-SHA-96authenticationprotocol
B. HMAC-MD5-96authenticationprotocol
CommunityStringMatchprotocol
D. NMAC-MD5-96authenticationprotocol
E. HMAC-SHA-96authenticationprotocol
Whichonesarethetwotypeofciphers？（）
A. Blockingcipherandnon-blockingcipher
B. CBCcipherandEBCcipher
C. BlockcipherandStreamcipher
D. BlockercipherandStreamercipher
E. 3DEScipherandAEScipher
WhichSSLprotocoltakesanapplicationmessagetobetransmitted，fragmentsthedataintomanageableblocks，optionallycompressesthedata，appliesaMAC，encrypts，addsaheader，andtransmitstheresultingunitinaTCPsegment？（）
A. SSLHandshakeProtocol
B. SSLAlertProtocol
C. SSLRecordProtocol
D. SSLChangeCipherSpecProtocol
ForaroutertoobtainacertificatefromaCA，whatisthefirststepofthecertificateenrollmentprocess？（）
A. theroutergeneratesacertificaterequestandforwardsittotheCA
B. theroutergeneratesanRSAkeypair
C. theroutersendsitspublickeytotheCA
D. theCAsendsitspublickeytotherouter
E. theCAverifiestheidentityoftherouter
F. theCAgeneratesacertificaterequestandforwardsittotherouter
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