单项选择题
A. SSL Handshake Protocol
B. SSLAlert Protocol
C. SSL Record Protocol
D. SSL Change CipherSpec Protocol
单项选择题 ForaroutertoobtainacertificatefromaCA，whatisthefirststepofthecertificateenrollmentprocess？（）
多项选择题 Whichtwostatementsarecorrectabouttheaaaauthenticationlogindefaultgrouptacacs+localglobalconfiguration command？（）
单项选择题 WhichCiscosecuritysoftwareproductmitigatesDayZeroattacksondesktopsandservers-stoppingknown andunknownattackswithoutrequiringreconfigurationsorupdatesontheendpoints？（）