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DNS - TCP or UDP - Network Ports Used by DNS - DNS or other Services works on both TCP and UDP Why is UDP used for DNS instead of TCP? Isn't TCP supposed networking - When do DNS queries use TCP instead of UDP Allow Both TCP and UDP Port 53 to Your DNS Servers Does DNS use TCP or UDP or both? - AllInterview Why DNS Works On Both TCP and UDP :: Admin :: Admin Tips When DNS Uses UDP Versus TCP - NS1 Technical Articles Why does DNS use UDP? - Quora Performance is a big reason. By comparison, TCP connections are very expensive with the whole SYN, SYN-ACK, ACK chain of events. Generally a dns So any application needs data to be transferred greater than 512 bytes require TCP in place. For example, DNS uses both TCP and UDP for valid Possible Duplicate: Is it true that a nameserver have to answer queries over TCP? I know DNS uses UDP for most of its queries, but in what circumstances This article explains why DNS works on both the protocols; TCP and UDP. RSS; sure that data is consistent by using TCP ACK bit. DNS uses UDP for DNS The original specifications for the Domain Name Service (DNS), contained in RFC 1034 (Mockapetris 1987a) which specifies the concepts and facilities Security practitioners for decades have advised people to limit DNS queries against their DNS servers to only use UDP port 53. The reality is that DNS Why is UDP used for DNS instead of TCP? Common uses for > 512 byte packets are records that include several entries of both A and AAAA type, Network Ports Used by DNS. The message sender can then choose to reissue the request to the DNS server using TCP Use extreme caution when editing Answer / jai. Sathyender is not wrong about the scenario when DNS uses TCP. Halon is correct by saying UDP is not limited to 512 bytes of data. DNS uses Hi there, It is stated the DNS can use both TCP and UDP. The DNS resolver uses UDP. My question is: when is TCP used for DNS? (exept zone transfer