What is the default administrative distance for OSPF?

The default administrative distance for OSPF (Open Shortest Path First) is 110. Administrative distance is a value used by routers to determine the trustworthiness of a routing source; lower values indicate a more trusted route. OSPF is a widely used and efficient Interior Gateway Protocol (IGP) that utilizes a link-state routing algorithm, making its information reliable and generally preferred for intra-domain routing.

The value of 110 is significant because it allows OSPF to be preferred over routing protocols like RIP (Routing Information Protocol), which has a default administrative distance of 120, but lower than EIGRP (Encapsulated Interior Gateway Routing Protocol) which has a default of 90 for internal routes. This setup facilitates efficient route selection in networks using multiple protocols by allowing OSPF to take precedence in situations where competing routes are available. Understanding the default administrative distance is crucial for configuring and troubleshooting routing protocols effectively in a network.