单项选择题
Which of these is the best way to provide sender non-repudiation？（）
A. pre-sharedkey
B. secure hash
C. SSL
D. RSA signature
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A. group 3
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Whataretheheadersizesforpoint-to-pointandmulti-pointGRE（alsoknownasmGRE）withtunnelkey？（）
A. 4 bytes for both
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单项选择题
Whichonesarethetwotypeofciphers？（）
A. Blocking cipher andnon-blocking cipher
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