area border router
CCNA
Introduction to Open Shortest Path First (OSPF)
Open Shortest Path First is a link-state routing protocol built to replace RIP, the distance-vector protocol that worked reasonably well in early, small networks but never scaled. RIP’s hop-count metric ignores bandwidth entirely and its full periodic table broadcasts don’t hold up as networks grow — problems OSPF was specifically designed to solve. Open Shortest...
CCNA
What Is a Stub Network? Routing, Configuration, and Real-World Use
Understanding stub networks and stub routers is fundamental to designing efficient networks, and a direct requirement for the CCNA exam. Stub networks show up in branch office designs, service provider edge connections, and anywhere a network segment has only one path in and out. This guide covers what a stub network is, why static and...