Which one of the following uses UDP as the transport protocol?
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.
Please comment below if you find anything wrong in the above post.
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