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OSPF Area – Inside the area, in detail; outside the area, just a summary | How the OSPF works | N-Study
How OSPF Protocol Works & Basic Concepts: OSPF Neighbor, Topology & Routing Table, OSPF Areas & Router Roles, Theory & Overview
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Designing Scalable OSPF Design > Designing Cisco Network Service Architectures (ARCH): Developing an Optimum Design for Layer 3 (CCDP) | Cisco Press
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