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4.2. Transport Connected: An Internet Encyclopedia
4.2. Transport

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4.2. Transport

4.2. Transport

The DNS assumes that messages will be transmitted as datagrams or in a byte stream carried by a virtual circuit. While virtual circuits can be used for any DNS activity, datagrams are preferred for queries due to their lower overhead and better performance. Zone refresh activities must use virtual circuits because of the need for reliable transfer.

The Internet supports name server access using TCP [RFC-793] on server port 53 (decimal) as well as datagram access using UDP [RFC-768] on UDP port 53 (decimal).


Next: 4.2.1. UDP usage

Connected: An Internet Encyclopedia
4.2. Transport

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