Which port is designated for DNS queries?

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Study for the CPSA Port Numbers Exam. Practice with flashcards and multiple choice questions, each with hints and explanations. Get ready for your test!

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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