This section will begin our lengthy discussion on OSPFv2 (Open Shortest Path First Version 2) concepts. OSPF is a link-state routing protocol that runs on each network router by exchanging OSPF messages with adjacent (neighboring) routers. The protocol uses these messages to build a complete view of the network topology and learn about all available IPv4 prefixes.
As always, the first section in the course breaks the OSPF concept into three significant lessons:
- Why do we need OSPF?
- How does OSPF work?
- What are OSPF's main principles?
The first lesson establishes the context of routing protocols in general, exploring the main routing protocol functions and the differences between interior and exterior routing protocols.
The second lesson explores how OSPFv2 works using neighbor relationships, messages exchange, and topology calculations.
The third lesson wraps up the section by looking at OSPF's basic routing protocol features and terms.
Most organizations have used OSPF as a primary routing protocol over the years. That's the reason the protocol has always been included in the CCNA's blueprint.
The newest CCNA exam version 200-301 is no exception and includes OSPFv2 into the blueprint.