Physical #2) Data-link #3) Network #4) Transport #5 Session #6) Presentation #7) Application Ospf? OSPF is the first widely deployed routing protocol. It can converge with a network in a few seconds, and it is one of the protocols that can provide loop-free paths. (Open Shortest Path First) BGP? Border Gateway Protocol (BGP) refers to a gateway protocol that enables the internet to exchange routing information between autonomous systems (AS). As networks interact with each other, they need a way to communicate. This is accomplished through peering.