Routers running OSPF uses Link State Advertisements (LSAs) in order to exchange topology information. Through LSAs, the tree is built within an area, and routers are able to learn about networks outside of their areas.

This tutorial will focus on the following LSA Types:

*If you want to see a specific LSA, fast forward to the time listed next to the LSA type*

LSA Type 1 (Router LSA): 1:25
LSA Type 2 (Network LSA): 3:45
LSA Type 3 (Summary LSA): 5:45
LSA Type 4 (ASBR Summary): 8:00
LSA Type 5 (External): 8:00
LSA Type 7 (NSSA External): 11:15
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