Which one of the following uses UDP as the transport protocol?
(A) HTTP
(B) Telnet
(C) DNS
(D) SMTP


Answer: (C)

Explanation:

UDP is a stateless ,connectionless and unreliable protocol.
HTTP needs connection to be established and thus,uses TCP.
Telnet is a byte stream protocol which again needs connection establishment ,thus uses TCP.
DNS needs request and response ,it needs a protocol in which a server can answer the small queries of large number of users. As UDP is fast and stateless it is the most suitable protocol and thus,it is used in DNS querying .
SMTP needs reliability and thus,uses TCP.

This solution is contributed by Shashank Shanker khare

//………….//
DNS uses UDP.
HTTP, Telnet and SMTP uses TCP.

Thus, C is the correct choice.

 
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