题目内容

A ____layer protocol provides for logical communication between applications.

A. transport
B. application
C. networking
D. MAC

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The receive side of transport layer reassembles segments into messages, passes to ____layer.

Application
B. Networking
C. Physical
D. MAC

The port number used by HTTP is ____.

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

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