Which interface characteristic is used to calculate cost of an interface in OSPF?

The correct answer is A. Bandwidth. OSPF calculates the cost of an interface using the formula: Cost = Reference Bandwidth / Interface Bandwidth. The default reference bandwidth is 100 Mbps. For example, a FastEthernet (100 Mbps) interface has a cost of 1 (100/100), while a T1 (1.544 Mbps) link has a cost of…

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ABandwidth
BLatency
CLoad
DReliability

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(22 responses)

A
95% (21)
B
5% (1)

Explanation

OSPF calculates the cost of an interface using the formula: Cost = Reference Bandwidth / Interface Bandwidth. The default reference bandwidth is 100 Mbps. For example, a FastEthernet (100 Mbps) interface has a cost of 1 (100/100), while a T1 (1.544 Mbps) link has a cost of approximately 64. OSPF always chooses the lowest-cost path to a destination, so higher-bandwidth interfaces are preferred. Latency, load, and reliability are metrics used by IGRP/EIGRP, not OSPF.

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#OSPF#cost metric#bandwidth#interface cost

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