Chapter 3-6 Multiarea OSPF

Question 1

What are three [3] issues with a single area OSPF?

Answer 1

1. Large Routing Tables
2. Large Link State Databases (LSDB)
3. Frequent SPF algorithm calculations

Question 2

What is required for a Multiarea OSPF?

Answer 2

hierarchical design with an area 0 backbone and all other areas connecting through the backbone. Area 0 is most often called the transit area as it usually does not have any users and is only used to process packets.

Question 3

What are two [2] Two-Layer Area Hierarchy

Answer 3

The Backbone (Transit) area
Regular (nonbackbone) area

Question 4

What are four [4] types of OSPF Routers

Answer 4

1. Internal Routers - All interfaces belong only to one area
2. Backbone Routers – Must belong to area 0
3. ABR – Belong to multiple areas, have multiple LSDB and neighbour tables, and it performs summarization and redistribution.
4. ASBRs – connect to an external network

Question 5

What does ABR stand for?

Answer 5

Area Border Router

Question 6

What does ASBR stand for?

Answer 6

Autonomous System Boundary Routers

Question 7

What are three [3] OSPF Router Calculation

Answer 7

1. Calculate intra-area routes and add them to the routing table.
2. Calculate best path to inter-areas.
3. Calculate best paths to the external destinations.

Question 8

What are four [4] Implementing OSPF

Answer 8

1. Gather network requirements and parameters
2. Define OSPF parameters
3. Configure OSPF
4. Verify OSPF