Why is DNS application layer?
Protocols at the Physical, Data-Link, Network, or Transport layers do not use names. Only applications need to use names, so DNS is an application-layer protocol because it allows the application to translate a name into a network address.
What application layer protocol does DNS use?
DNS is an application layer protocol. All application layer protocols use one of the two transport layer protocols, UDP and TCP. TCP is reliable and UDP is not reliable. DNS is supposed to be reliable, but it uses UDP, why?
In which layer DNS works and explain its working?
First off, DNS belongs to the TCP/IP suite and thus falls under the TCP/IP model, not the OSI model. From a functionality perspective, DNS is pretty clearly part of the application layer (that’s layer 4). It’s invoked by the application layer and rides on top of the transport layer (UDP).
What are the three domains of DNS?
DNS is a TCP/IP protocol used on different platforms. The domain name space is divided into three different sections: generic domains, country domains, and inverse domain.