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Networking Fundamentals · Intermediate

DNS over TLS (DoT)

Encrypting DNS queries with TLS on dedicated TCP port 853.

Definition

DoT (RFC 7858) encrypts DNS on its own port, so network administrators can identify and allow or block it more easily than DoH.

Example

Android's Private DNS setting uses DNS over TLS on port 853.

Exam tip

DoT uses port 853.

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