OSPF for CCNA 200-301 (Neighbors, DR/BDR, Cost, Troubleshooting)

🚀 Want to master OSPF for the CCNA without getting lost in the weeds? In this video, I break down OSPF in a clear, beginner-friendly way — including how neighbors form, how routing decisions are made, and how to troubleshoot the most common issues you’ll see in labs and on the exam. ✅ What you’ll learn in this OSPF lesson: What OSPF is and how it works (Link-State + SPF) OSPF Cost and route selection (best path) OSPF Neighbor States (Down → Full) Why you may see 2-WAY vs FULL DR/BDR Election on broadcast networks Common issues: MTU mismatch (EXSTART/EXCHANGE), timer mismatches, area mismatches Best verification commands: show ip ospf neighbor show ip ospf interface brief show ip route ospf 📌 If you’re studying for the CCNA 200-301, this is one of the most important routing protocols to understand. 👍 If this helped, drop a like and subscribe for more CCNA + networking content!