title: DNS working based on layer to layer of OSI layers
body: <p>How actually DNS will work based on different layers of OSI? I mean when we will type google.com, it will mapped IP Address of google.com with its domain name.But when we are not knowing the IP address of Authoritative DNS server, so how it will move to different Layers of OSI (TL,NL, DLL) of our system to Authoritative DNS Server?</p>