单项选择题

What are the header sizes for point-to-point and multi-point GRE（also known asmGRE） with tunnel key？（）

A. 4 bytes for both
B. 4 bytes， and 8 bytes respectively
C. 8 bytes for both
D. 24 bytes for both

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单项选择题

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

单项选择题

WhichSSLprotocoltakesanapplicationmessagetobetransmitted，fragmentsthedataintomanageableblocks，optionallycompressesthedata，appliesaMAC，encrypts，addsaheader，andtransmitstheresultingunitinaTCPsegment？（）

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