题目内容

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

There are three classes of DNS server except ( ).

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

The time it takes for a small packet to travel from client to server and then back to the client is ( ).

A. round-travel time
B. next-hop time
C. round-trip time
D. prefix-matching time

In the four following options, which protocol is included in Mail Access Protocol?( )

A. TCP
B. DHCP
C. IMAP
D. FTP