📖 What is Link-State Advertisement (LSA)?
Data structures used by OSPF routers to advertise their links, states, and costs to other routers in the OSPF area.
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Sensei Says:
"For CCNA Single Area OSPF, you mostly care about Type 1 (Router) and Type 2 (Network) LSAs. Type 2 is only generated by the DR on a multi-access network."
📚 Certification: Certified Network Associate (200-301)
🔑 What are the Key Concepts of Link-State Advertisement (LSA)?
- ▸ Topology building blocks
- ▸ LSA types (1 through 5 for CCNA)
- ▸ Flooding mechanism
🎯 How does Link-State Advertisement (LSA) appear on the 200-301 Exam?
Analyzing the OSPF database to see which router generated a specific Type 1 LSA.
Understanding how a change in link status triggers an immediate LSA update.
❓ Frequently Asked Questions
What is a Type 1 LSA?
It's a Router LSA generated by every router to advertise its directly connected OSPF links.
How often are LSAs refreshed?
OSPF refreshes LSAs every 30 minutes to ensure the database remains accurate.
Related Terms from Certified Network Associate
Syslog
Floating Static Route
Puppet
Transmission Control Protocol (TCP)
OSPF Interface Priority
WPA2 (Wi-Fi Protected Access 2)