多項(xiàng)選擇題Choose the most correct statements about SMTP/ESMTP. ()

A. Open mail relays are often used for spamming.
B. ESMTP does NOT provide more security features than SMTP
C. SMTPdoes provide authenticated email sending."
D. Worms often spread via SMTP.


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C. group 5
D. group 7

4.單項(xiàng)選擇題What are the header sizes for point-to-point and multi-point GRE(also known asmGRE) with tunnel key?()

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B. 4 bytes, and 8 bytes respectively
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5.單項(xiàng)選擇題Which ones are the two type of ciphers?()

A. Blocking cipher andnon-blocking cipher
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