Which statement best describes an Open Shortest Path First (OSPF) area border router (ABR)? A. It maintains a link-state database for only a single area’s topology.
B. It maintains a link-state database for each area to which it is connected.
C. It floods summary link advertisements (SLA) to only its assigned area, dropping all other SLAs.
D. It connects to routers located in other autonomous systems (AS).
The correct answer is:
B. It maintains a link-state database for each area to which it is connected.
Explanation: An Open Shortest Path First (OSPF) area border router (ABR) is responsible for connecting different OSPF areas within a single autonomous system. As such, it maintains separate link-state databases for each area it connects to, allowing it to handle the routing information for multiple areas effectively. This enables the ABR to summarize and redistribute routing information between the areas. If you need more in-depth information on OSPF and its components, I encourage you to check the extended services page for additional resources!