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Why DNS use both TCP and UDP ports. And for which purpose
it uses TCP and UDP.
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Answer Posted / srinivas podapati
DNS uses TCP for Zone transfer and UDP for name queries
either regular (primary) or reverse. UDP can be used to
exchange small information whereas TCP must be used to
exchange information larger than 512 bytes. If a client
doesn't get response from DNS it must re-transmit the data
using TCP after 3-5 seconds of interval.
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