What port on a name server is used for User Datagram Protocol (UDP) name request packets?
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5
Answer:
A DNS server used well-known port 53 for all its UDP activities and as its server port for TCP.
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0
Answer:
53
Explanation:
DNS uses the User Datagram Protocol (UDP) on port 53 to serve DNS queries. UDP is preferred because it is fast and has low overhead. A DNS query is a single UDP request from the DNS client followed by a single UDP reply from the server.
If a DNS response is larger than 512 bytes, or if a DNS server is managing tasks like zone transfers (transferring DNS records from primary to secondary DNS server), the Transmission Control Protocol (TCP) is used instead of UDP, to enable data integrity checks.
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