Which port is used by DNS over TLS (DoT)?

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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 used by DNS over TLS (DoT)?

Explanation:
DNS over TLS encrypts DNS traffic by wrapping it in TLS, and it uses a dedicated port defined for this service. The TLS layer requires a reliable, ordered connection, which is provided by TCP, so DoT operates on port 853 over TCP. UDP is used for standard DNS (unencrypted) on port 53, but not for DoT, since TLS over UDP (DTLS) is not the typical setup for DoT. Therefore, the correct understanding is that DNS over TLS uses port 853 on TCP.

DNS over TLS encrypts DNS traffic by wrapping it in TLS, and it uses a dedicated port defined for this service. The TLS layer requires a reliable, ordered connection, which is provided by TCP, so DoT operates on port 853 over TCP. UDP is used for standard DNS (unencrypted) on port 53, but not for DoT, since TLS over UDP (DTLS) is not the typical setup for DoT. Therefore, the correct understanding is that DNS over TLS uses port 853 on TCP.

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