FTP uses two parallel connections to transfer a file, they are ( ).
A. TCP and UDP connection
B. connection with pipelining and without pipelining
C. control an data connection
D. client-server and browser-server connection
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In the following four services, which one can not provide by DNS?( )
A. Host aliasing
B. Mail server aliasing
C. translate hostname to IP addresses
D. translate MAC addresses to IP addresses
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
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
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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