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Router types
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cisco - if ABR and ASBR both are the same in OSPF,what might be reason to use NSSA? - Network Engineering Stack Exchange
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OSPF Areas, ABR & ASBR Routers Tutorial - YouTube
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Area Border Router - an overview | ScienceDirect Topics
Area border routers (ABRs)
OSPF - Part 2: How OSPF Protocol Works & Basic Concepts: OSPF Neighbor, Topology & Routing Table, OSPF Areas & Router Roles, Theory & Overview
OSPF Area Border Router | Computer Network Design and Architecture
