OSPF-9

Question 1

What is the purpose of Area 0 in OSPF?

Answer 1

A: Area 0 is the backbone area and all other areas must connect to it directly or via a virtual link.

Explanation: It ensures inter-area routing and proper SPF tree calculations across areas.

Question 2

Do all routers in an OSPF area share the same topology table?

Answer 2

A: Yes, all routers within an area maintain an identical LSDB (topology table).

Explanation: This ensures consistent SPF path calculations within that area.

Question 3

What metric does OSPF use for path selection?

Answer 3

A: OSPF uses cost as its metric.

Explanation: Cost is based on the bandwidth of the interface; lower cost = preferred path.

Question 4

Must both routers assign the same OSPF cost for a link?

Answer 4

A: Ideally yes, for consistent routing behavior.

Explanation: Although not mandatory, matching costs ensures symmetric routing and avoids confusion.

Question 5

What is the significance of the OSPF process ID?

Answer 5

A: It uniquely identifies the OSPF instance on a router.

Explanation: The process ID is locally significant and allows multiple OSPF processes on the same router.