Single-area OSPFv2 concepts: router IDs, network types, DR/BDR, and adjacency formation

By the end you’ll be able to

• Explain the purpose of single-area OSPFv2 and the role of Area 0 in CCNA-level deployments.
• Determine how an OSPFv2 router ID is selected and identify how manual router ID configuration affects that selection.
• Differentiate OSPFv2 point-to-point and broadcast network types in terms of neighbor relationships and adjacency behavior.