📖 What is Open Shortest Path First version 2 (OSPFv2)?
An interior gateway protocol (IGP) for IPv4 networks that uses a link-state routing algorithm to calculate the shortest path to all known destinations.
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Sensei Says:
"OSPF uses cost as its metric. Remember that the default reference bandwidth is 100 Mbps, so FastEthernet and Gigabit interfaces will have the same cost of 1 unless you adjust it!"
📚 Certification: Certified Network Associate (200-301)
🔑 What are the Key Concepts of Open Shortest Path First version 2 (OSPFv2)?
- ▸ Dijkstra's Shortest Path First algorithm
- ▸ Link-state routing protocol
- ▸ Areas and backbone (Area 0)
🎯 How does Open Shortest Path First version 2 (OSPFv2) appear on the 200-301 Exam?
Configuring single-area OSPF on a network and verifying neighbor adjacencies.
Troubleshooting OSPF metrics (cost) on links with different bandwidths.
❓ Frequently Asked Questions
What metric does OSPF use to determine the best path?
OSPF uses 'cost', which is inversely proportional to the bandwidth of the link.
What is the purpose of Area 0 in OSPF?
Area 0 is the backbone area. In multi-area OSPF, all other areas must connect to Area 0.
Related Terms from Certified Network Associate
Port Address Translation (PAT)
Inside Global Address
Rapid Spanning Tree Protocol (RSTP)
BPDU Guard
DHCP Snooping
Administrative Distance (AD)