1.

Differentiate between Open Shortest Path First (OSPF) and Border Gateway Protocol (BGP).

Answer»

Open Shortest Path First (OSPF): Open shortest path first (OSPF) is a link-state routing protocol that USES its own shortest path first (SPF) algorithm to discover the optimum path between the SOURCE and DESTINATION router. A link-state routing protocol employs the idea of triggered updates, in which updates are only triggered when a change in the learnt routing table is detected, as opposed to the distance-vector routing protocol, in which the routing table is exchanged over a period of time. Open shortest path first (OSPF) is an Interior Gateway Protocol (IGP)  that tries to move packets within a large autonomous system or routing domain. It's a network layer protocol that uses AD value 110 and runs on protocol number 89. OSPF employs the multicast address 224.0.0.5 for routine communication and 224.0.0.6 for updates to designated ROUTERS (DRs) and backup designated routers (BDRs) (BDR).

Following are the differences between Border Gateway Protocol (BGP) and Open Shortest Path First (OSPF):

Open Shortest Path First (OSPF)Border Gateway Protocol (BGP)
Open Shortest Path First is a fast concurrency protocol.BGP is a slow concurrency protocol.
OSPF is a network topology or design that is hierarchical.It uses a sort of mesh topology or design.
Internal gateway protocol is another name for it.It is referred to as an external gateway protocol.
OSPF is a simple protocol to set up.BGP implementation is challenging.
It connects to port 89.It works with port number 179.
The internet protocol is EMPLOYED in OSPF.Transmission control protocol is employed in this.
OSPF is a type of Link State.BGP is a Vector State type.
The Dijkstra algorithm is employed in OSPF.The best path algorithm is employed in this case.
OSPF prioritises the quickest path over the shortest path.BGP prefers the best path.


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