Which port and protocol is commonly used by DNS for TCP queries or zone transfers?

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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 and protocol is commonly used by DNS for TCP queries or zone transfers?

Explanation:
DNS uses a fixed port 53. For typical lookups it uses UDP on that port, but when reliability is needed or for transferring zone data between servers, DNS switches to TCP on the same port. So for TCP-based DNS queries or zone transfers, the correct pairing is port 53 with TCP.

DNS uses a fixed port 53. For typical lookups it uses UDP on that port, but when reliability is needed or for transferring zone data between servers, DNS switches to TCP on the same port. So for TCP-based DNS queries or zone transfers, the correct pairing is port 53 with TCP.

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