Eli5 : Ospf in networking?
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OSPF (Open Shortest Path First) is an algorithm for determining which route to take to reach the destination.
Internet network consists of many connection between locations, just like roads between cities. Usually there are multiple possible ways to reach your destination, but you must choose one. Usually we want to choose the shortest (fastest) route.
OSPF is a set of rules how routers communicate with each other to find out what roads connect them, and which is the shortest for each destination. And how to update others about road conditions, in case some road becomes closed. ( For example someone damages cable)
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