DNS over TLS (DoT) operates on which port?

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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

DNS over TLS (DoT) operates on which port?

Explanation:
DNS over TLS wraps DNS queries in TLS, so it runs over TCP to provide a reliable, encrypted stream. The standard port for DoT is 853, and it is used with TCP. UDP isn’t used for DoT because TLS requires the connection-oriented nature of TCP. So the correct idea is that DoT operates on port 853 using TCP (not UDP), even though one option lists 853 with both protocols.

DNS over TLS wraps DNS queries in TLS, so it runs over TCP to provide a reliable, encrypted stream. The standard port for DoT is 853, and it is used with TCP. UDP isn’t used for DoT because TLS requires the connection-oriented nature of TCP. So the correct idea is that DoT operates on port 853 using TCP (not UDP), even though one option lists 853 with both protocols.

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