Which port is designated for DNS queries?

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Prepare for the CPSA Port Numbers Exam with quizzes on port numbers, services, and protocols. Each question is accompanied by hints and detailed explanations. Get exam-ready with our comprehensive study tool!

Multiple Choice

Which port is designated for DNS queries?

Explanation:
DNS queries use port 53. By default, DNS runs over UDP on this port because UDP is fast and enough for typical small query/response messages. If the response is large or reliability is needed (for example, during zone transfers or when a UDP response is truncated), DNS can switch to TCP on the same port 53.

DNS queries use port 53. By default, DNS runs over UDP on this port because UDP is fast and enough for typical small query/response messages. If the response is large or reliability is needed (for example, during zone transfers or when a UDP response is truncated), DNS can switch to TCP on the same port 53.

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