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Question ID 6454

Which parameter or parameters are used to calculate OSPF cost in Cisco routers?

Option A

A. Bandwidth

Option B

Bandwidth and Delay

Option C

. Bandwidth, Delay, and MTU

Option D

. Bandwidth, MTU, Reliability, Delay, and Load

Correct Answer a
Explanation The well-known formula to calculate OSPF cost is Cost = 108/ Bandwidth


Question ID 6455

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

Option A

to decrease latency by increasing bandwidth

Option B

. to reduce routing overhead

Option C

to speed up convergence

Option D

to confine network instability to single areas of the network

Option E

to reduce the complexity of router configuration

Option F

to lower costs by replacing routers with distribution layer switches

Correct Answer bcd
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:

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