Which port is designated for DNS queries?

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Prepare for the CPSA Port Numbers exam with multiple choice questions and detailed explanations. Understand key protocols and services to excel in 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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