超星 - 自测题 ch2

单选题

There are three classes of DNS servers, there are ( ).

A. root DNS server, top-level domain DNS server and local DNS server
B. root DNS server, top-level domain DNS server and authoritative DNS server
C. root DNS server, local DNS server and authoritative DNS server
D. root DNS server, local DNS server and top-level domain DNS server

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单选题

In HTTP request message, the entity body is empty with the ( )method, but is used with the ( )method.

A. GET, POST
B. POST,GET
C. GET, HEAD
D. POST, HEAD

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单选题

In the following four options, which one is not the part of cookie technology?( )

A. Cookie header lines in the HTTP response message and request message.
B. One cookie header file kept on the user’s end system and managed by the user’s browser.
C. A network entity that satisfies HTTP requests on the behalf of an origin Web server.
D. A back-end database at the Web site

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单选题