题目内容

In the following descriptions about HTTP, which one is not correct?( )

A. HTTP uses UDP as its underlying transport protocol.
B. HTTP uses TCP as its underlying transport protocol.
C. HTTP is a stateless protocol.
D. HTTP is client-server architecture.

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Suppose a web page consists of a base HTML file, 5 JEPG images and a java applet, and also suppose HTTP uses persistent connection without pipelining, the total response time is( ).

A. 2 RTT
B. 8 RTT
C. 12 RTT
D. 14 RTT

In HTTP response message, if the requested HTTP protocol version is not supported, the status code is( ).

A. 200
B. 301
C. 400
D. 505

The widely used port number of web application is( ).

A. 25
B. 20
C. 80
D. 53

HTTP has a mechanism that allows a cache to verify that its objects are up to date. The mechanism is( ).

A. persistent connections
B. cookies
C. Web Caching
D. conditional GET