OSPF ( open Shortest Path First)
Open shortest path first is a routing protocols developed for internet protocols networks by the interior gateway protocols working group of the internet engineering task force.
OSPF has two primary characteristics. The first is that is protocols is open which means that its specification is the public domain. The second principle characteristics is that OSPF is based on the SPF algorithm, which sometimes is referred to as the dijkstra algorithm. OSPF accumulate link state information they use the SPF algorithm to calculate the shortest path to each node.