Dns name resolution (DNS)
Hence computer always goes with numbers , but it's quit difficult remember numbers by humans to overcome this issue DNS concept is introduced
Dns maps domain names to IP address
Example.com => 211.X.X.X
There are two types of DNS querries
- Recursive querry
- iterative querry
=> Recursive querry reslove domain names within local DNS server
=> Iterative querry reslove domain names with help of global dns like
==> ISP name server ==> root dns server==> top level servers (TLD) dns servers ==> authoritative dns servers .
authoritative dns servers are dns server maintenaned by individuals organization as per there business requirements.
Hence TCP is reliable protocol . TCP handshake should be completed successfully before sending actually data from client -- > servers
User datargram protocols is non reliable protocols . Mainly used for DNS traffic , voice traffic .