Domain Name System Dns Uses Both Tcp And Udp

If a client computer does not get response from a dns server it must re transmit the dns query using the tcp after 3 5 seconds of interval. Both protocols are used to send packets of data over the internet. This is used when a client device e g a computer smartphone etc communicates with a dns server in order to resolve a specific domain name as described above.

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A client computer will always send a dns query using udp protocol over port 53.

Domain name system dns uses both tcp and udp. Tcp is slow as it requires 3 way. The most frequently used port for dns is udp 53. There are various ways of sending data over ip tcp udp dccp sctp rsvp and more. We will focus our attention on the two that are most used the udp user datagram protocol and the tcp transmission control protocol.

There are following interesting facts about tcp and udp on the transport layer that justify the above. Tcp is reliable and udp is not reliable. What is dns port number. All application layer protocols use one of the two transport layer protocols udp and tcp.

1 udp is much faster. Dns uses both tcp and udp port 53. Dns is supposed to be reliable but it uses udp why. Dns uses udp for dns queries over port.