题目内容

The port number used by HTTP is ____.

A. 80
B. 25
C. 110
D. 53

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The port number used by FTP is ____.

A. 20 and 21
B. 20
C. 21
D. 53

A UDP socket identified by a ____ tuple(s).

A. 2
B. 4
C. 1
D. 3

A TCP socket identified by a ____ tuple(s).

A. 2
B. 4
C. 1
D. 3

A TCP socket does not include____.

A. Source MAC address
B. Source port number
C. Destination IP address
Destination port number