MTCNA Exam Dumps | Which of the following protocols uses both TCP and UDP?

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Question 42/90

Which of the following protocols uses both TCP and UDP?

A. FTP

B. SMTP

C. Telnet

D. DNS

Correct Answer: D

DNS (Domain Name System) can use both UDP and TCP. Typically:
* UDP port 53 is used for standard DNS queries due to its lower overhead.
* TCP port 53 is used for DNS zone transfers and when DNS responses exceed the UDP packet size (e.g., DNSSEC).
MTCNA Course Material - Protocol Overview:
"DNS uses UDP port 53 for standard queries and TCP port 53 for zone transfers or large responses." Rene Meneses MTCNA Study Guide - Protocol Functions:
"DNS can operate over UDP and TCP. UDP is faster and used for most lookups. TCP is used when the payload is too large or for zone transfers." MikroTik Wiki - DNS Protocols:
"DNS primarily uses UDP 53. For zone transfers (AXFR), TCP 53 is used." Other options:
* A. FTP uses TCP (ports 20/21)
* B. SMTP uses TCP (port 25)
* C. Telnet uses TCP (port 23)
Only DNS uses both TCP and UDP.

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