OSPF-5

Question 1

What algorithm does OSPF use to compute the shortest path to each network?

Answer 1

A: Dijkstra algorithm (Shortest Path First - SPF)

Explanation: Also known as the SPF (Shortest Path First) algorithm, Dijkstra calculates the shortest path to all known destinations within an area by constructing a tree with the router as the root.

Question 2

Can OSPF install multiple equal-cost paths to the same destination?

Answer 2

A: Yes.

Explanation: OSPF supports Equal-Cost Multi-Path (ECMP) routing, which allows it to load balance traffic across multiple links with the same cost metric.

Question 3

What IP versions does OSPF support?

Answer 3

A: OSPF supports both IPv4 and IPv6.

Explanation: OSPFv2 is used for IPv4 networks, and OSPFv3 is the enhanced version that supports IPv6.

Question 4

What type of network design does OSPF promote?

Answer 4

A: Hierarchical design using areas.

Explanation: OSPF allows large networks to be divided into areas, improving scalability and limiting the scope of routing updates.

Question 5

What is the path selection metric used by OSPF?

Answer 5

A: Bandwidth.

Explanation: OSPF uses the cost metric, which is inversely related to bandwidth—the higher the bandwidth, the lower the cost.