Which of the following services relies on UDP?
A.
FTP
B.
Telnet
C.
DNS
D.
SMTP
Explanation:
DNS primarily uses User Datagram Protocol (UDP) on port number 53 to serve requests.DNS queries consist
of a single UDP request from the client followed by a single UDP reply from the server.
Incorrect Answers:
A: FTP uses the TCP protocol.
B: Telnet uses the TCP protocol.
C: SMTP uses the TCP protocol.https://en.wikipedia.org/wiki/Domain_Name_System