CCNA: Cisco Certified Network Associate — Question 139

Which three describe the reasons large OSPF networks use a hierarchical design? (Choose three.)

Answer options

• A. to speed up convergence
• B. to reduce routing overhead
• C. to lower costs by replacing routers with distribution layer switches
• D. to decrease latency by increasing bandwidth
• E. to confine network instability to single areas of the network
• F. to reduce the complexity of router configuration

Correct answer: A, B, E

Explanation

The correct answers A, B, and E highlight the benefits of a hierarchical design in OSPF networks, which include faster convergence times, decreased routing overhead, and the ability to isolate network issues to specific areas. Options C and D do not directly relate to OSPF's hierarchical design objectives, while option F, although relevant to configuration, is less about the hierarchical structure itself.