CREST Practitioner Security Analyst (CPSA) Practice

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What protocol is described as a link-state routing protocol used on IP networks?

OSPF
BGP
EIGRP
RIP

The correct answer is: OSPF

The protocol being described as a link-state routing protocol used on IP networks is OSPF (Open Shortest Path First). OSPF is designed to efficiently manage routing information within a single autonomous system while enabling routers to exchange information about the network topology. Link-state protocols like OSPF function by having each router maintain a complete map of the network. This allows them to calculate the shortest path to any given destination using algorithms such as Dijkstra’s algorithm. The ability to have a detailed understanding of the network topology allows OSPF to react quickly to changes, such as the addition of new routers or changes in network topology, making it more robust and scalable than distance-vector protocols. In contrast, while BGP (Border Gateway Protocol) is indeed a crucial routing protocol used on the Internet, it is classified as a path-vector protocol, not a link-state protocol. EIGRP (Enhanced Interior Gateway Routing Protocol) combines features of both link-state and distance-vector routing protocols but is fundamentally a hybrid protocol rather than a pure link-state one. RIP (Routing Information Protocol) is a distance-vector routing protocol, characterized by its simpler approach to routing that does not provide the same level of detail about the network as link-state protocols do.