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Open Shortest Path First For our next lesson, we introduce you to Open Shortest Path First routing protocol. We'll examine the differences between OSPF and EIGRP, as well as the differences between a link state protocol (OSPF) and a distance vector routing. For example, you'll learn that routing updates are not sent in OSPF and why, and what its function is and what a Link State Advertisement is. You'll learn what routers flood LSA information, how the LSA information builds a link state database and what how the SPF algorithm independently calculates its own routes to remote destinations.