题目内容

The Internet’s ____ service helps prevent the Internet from entering a state of gridlock .

A. datagram
B. congestion control
C. sliding window
D. timeout event

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Connection setup at the transport layer involves ____.

A. server
B. only the two end systems
C. client
D. router

A ____layer protocol provides for logical communication between applications.

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

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