Which of the following protocols uses both TCP and UDP ports?

Which of the following protocols uses both TCP and UDP ports?

Which of the following protocols uses both TCP and UDP ports?

A.
SMTP

B.
Telnet

C.
FTP

D.
DNS

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IT Engineer

IT Engineer

DNS can use either the User Datagram Protocol (UDP) or Transmission Control Protocol (TCP) with a destination port of 53.

Note:

+Simple Mail Transfer Protocol (SMTP) is specified for mail transport and uses TCP port 25.
+ Telnet uses TCP on port 23.
+ File Transfer Protocol (FTP) uses TCP on port 20, 21.
+ Trivial File Transfer Protocol (TFTP) uses UDP on port 69.
+ HTTP Secure (HTTPS) uses TCP on port 443.

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