Cisco 100-105 Exam

Why do large OSPF networks use a hierarchical design? (Choose three.)

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

OSPF implements a two-tier hierarchical routing model that uses a core or backbone tier known as area zero (0). Attached to that backbone via area border routers (ABRs) are a number of secondary tier areas. The hierarchical approach is used to achieve the following:
– Rapid convergence because of link and/or switch failures
– Deterministic traffic recovery
– Scalable and manageable routing hierarchy, reduced routing overhead.

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