OSPF-8

Question 1

What is the role of the Designated Router (DR) in OSPF?

Answer 1

A: The DR minimizes the number of adjacencies on multi-access networks by acting as the central point for exchanging LSAs.

Explanation: This reduces overhead in OSPF by avoiding a full mesh of neighbor relationships.

Question 2

How is the DR elected in OSPF?

Answer 2

A: The router with the highest priority wins the DR election. If priorities are equal, the highest Router ID wins.

Explanation: This ensures deterministic selection based on pre-configured values or loopback/interface IPs.

Question 3

What is the Backup Designated Router (BDR)?

Answer 3

A: A standby router that takes over if the DR fails. It receives LSAs but doesn’t forward them unless promoted.

Explanation: BDR ensures high availability in OSPF networks.

Question 4

What is the OSPF Hello Protocol used for?

Answer 4

A: It provides dynamic neighbor discovery and maintains OSPF relationships.

Explanation: Hello packets are used to establish and keep neighbor adjacencies alive.

Question 5

What is stored in the OSPF neighborship database?

Answer 5

A: A list of all routers from which Hello packets have been received.

Explanation: This database tracks potential OSPF neighbors for adjacency formation.