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OSPF Areas and LSA Types This lesson explains and diagrams the concept of areas, how and why they are created, and how they impact the flow of traffic between routing devices. For example, you will learn why it's important that there be an Area 0 and what the consequences of traffic flow are if there is not an Area 0. Then we look at the various LSA types such as the Networking LSA and examine how its functionality is affected by an Area's designations.