单项选择题

What group in Cisco IOS does 1536-bit Diffie-Hellman prime modulus equivalent too？（）

A. group 3
B. group 1
C. group 5
D. group 7

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

A. 4 bytes for both
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Which ones are the two type of ciphers？（）

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