Which two options are classified as link-state routing protocols? (Choose two.)
- BGP
- RIPv2
- EIGRP
- OSPF
- IS-IS
Explanation: Open Shortest Path First (OSPF) and Intermediate System-to-Intermediate System (IS-IS) are both classified as link-state routing protocols. OSPF functions by having routers generate Link State Advertisements (LSAs), which describe the state of their interfaces and relationships with neighbors. These LSAs are flooded throughout an area so that every router can piece together an identical link-state database (LSDB) representing the complete network topology.
The other protocols listed are categorized differently:
- RIPv2 is a traditional distance vector routing protocol.
- EIGRP is described as an advancement on distance vector protocols that combines advantages of both link-state and distance vector mechanisms, but it is primarily based on distance vector principles where information is learned from directly connected neighbors.
- BGP is defined as a path vector protocol that uses path attributes to exchange reachability information between different autonomous systems.
Related exam: Modules 8 – 13: Checkpoint Exam: Network Routing Answers (CCNP ENCOR v9)
