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Network Ports Used by DNS - DNS or other Services works on both TCP and UDP Why does DNS use UDP? - Quora Why DNS Works On Both TCP and UDP :: Admin :: Admin Tips DNS - TCP or UDP - When DNS Uses UDP Versus TCP - NS1 Technical Articles Allow Both TCP and UDP Port 53 to Your DNS Servers How does the DNS protocol switch from UDP to TCP? Why is UDP used for DNS instead of TCP? Isn't TCP supposed networking - When do DNS queries use TCP instead of UDP 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, Before anyone asks: I've seen When do DNS queries use TCP instead of UDP? and it doesn't answer my question. All I keep hearing is if the answer is too 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 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 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 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 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 The original specifications for the Domain Name Service (DNS), contained in RFC 1034 (Mockapetris 1987a) which specifies the concepts and facilities 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 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