Which ones are the two type of ciphers？（）

A. Blocking cipher andnon-blocking cipher
B. CBC cipher and EBC cipher
C. Block cipher and Stream cipher
D. Blocker cipher and Streamer cipher
E. 3DES cipher and AES cipher

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单项选择题

Which SSL protocol takes anapplication message tobe transmitted， fragments the datainto manageable blocks， optionally compresses the data， applies a MAC， encrypts， adds a header， and transmits the resulting unit ina TCPsegment？（）

A. SSL Handshake Protocol
B. SSLAlert Protocol
C. SSL Record Protocol
D. SSL Change CipherSpec Protocol

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For a router to obtain a certificate from a CA， what is the first stepof the certificate enrollment process？（）

A. the router generates a certificate request and forwards it tothe CA
B. the router generates an RSA key pair
C. the router sends its public key to the CA
D. the CA sends its public key to the router
E. the CA verifies the identity of the router
F. the CA generates a certificate request and forwards it to the router

多项选择题

Which two statements are correct about the aaa authentication login default grouptacacs+ localglobal configuration command？（）

A. this login authenticationmethod list is automaticallyapplied to all lines except those that have a named method list explicitly defined
B. If the user fails the TACACS+ authentication then the local database on the router will be used to authenticatethe user
C. if the tacacs+ server fails to respond then the local database on the router will be used to authenticate the user
D. "login" is the name of the method list being configured
E. if the tacacs+ server is unavailable， authentication will succeed automaticallyby default

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