Which of the following protocols does DNS utilize on port 53?

The correct answer is A. TCP. DNS (Domain Name System) uses port 53 and operates over both UDP and TCP. UDP port 53 is used for standard queries due to its speed, while TCP port 53 is used for larger responses (over 512 bytes) and zone transfers between DNS servers. Among the choices given, TCP is the only…

Networking concepts

Question

Options

ATCP
BFTP
CRTP
DICMP

How the community answered

(42 responses)

A
88% (37)
B
2% (1)
C
2% (1)
D
7% (3)

Explanation

DNS (Domain Name System) uses port 53 and operates over both UDP and TCP. UDP port 53 is used for standard queries due to its speed, while TCP port 53 is used for larger responses (over 512 bytes) and zone transfers between DNS servers. Among the choices given, TCP is the only transport protocol listed. FTP is an application-layer protocol (ports 20/21), RTP is used for real-time media streaming, and ICMP is used for diagnostics (e.g., ping) - none of these are associated with DNS on port 53.

Topics

#DNS#port 53#TCP#application protocols

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