Drag and drop each OSPF LSA type on the left to its matching description on the right.
Drag a concept onto its matching description — or click a concept then click the description.
Describes a router's directly attached links and interfaces
Generated by the DR to list all routers on a multiaccess segment
Advertises inter-area prefixes between areas
Advertises the location of an ASBR to other areas
Advertises external routes redistributed into OSPF
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Type 1 (Router LSA): Describes a router's directly attached links and interfaces
LSA Type 1 (Router LSA) describes a router's own interfaces and links. Type 2 (Network LSA) is generated by the DR to describe all routers on a multiaccess network. Type 3 (Summary LSA) advertises networks from one area to another. Type 4 (ASBR Summary LSA) advertises the location of an ASBR. Type 5 (AS External LSA) advertises external routes redistributed into OSPF.
Visual reference
Quick reference
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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