题目内容

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

A. The server leaves the TCP connection open after sending a response.
B. Each TCP connection is closed after the server sending one object.
C. There are two versions of persistent connection: without pipelining and with pipelining.
D. The default mode of HTTP uses persistent connection with pipelining.

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FTP uses two parallel TCP connections to transfer a file, there are( ).

A. control connection and data connection
B. receiving connection and sending connection
C. client connection and sever connection
D. program connection and process connection

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If the status code in HTTP response message is 404, it means( ).

A. Request succeeded.
B. The requested document doesn’t exit on this server.
C. This is a generic error code indicating that the request could not be understood by the server.
D. Requested object has been permanently mover.

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DNS means ( ).

A. Data Name System
B. Data National System
C. Domain Name System
Domain National System

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There are three classes of DNS server except ( ).

A. Root DNS server
B. Local DNS server
C. TLD server
D. Authoritative DNS server

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