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

The correct answer is A. Bandwidth. Cisco's OSPF implementation calculates cost using only bandwidth. The formula is: Cost = Reference Bandwidth / Interface Bandwidth. The default reference bandwidth is 100 Mbps, so a Fast Ethernet (100 Mbps) link has a cost of 1, and a 10 Mbps Ethernet link has a cost of 10. Optio

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Question

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

Exhibit

Options

ABandwidth
BBandwidth and Delay
CBandwidth, Delay, and MTU
DBandwidth, MTU, Reliability, Delay, and Load

How the community answered

(35 responses)

A
89% (31)
B
6% (2)
C
3% (1)
D
3% (1)

Explanation

Cisco's OSPF implementation calculates cost using only bandwidth. The formula is: Cost = Reference Bandwidth / Interface Bandwidth. The default reference bandwidth is 100 Mbps, so a Fast Ethernet (100 Mbps) link has a cost of 1, and a 10 Mbps Ethernet link has a cost of 10. Options B, C, and D describe the composite metric used by EIGRP (K-values), which can include bandwidth, delay, MTU, reliability, and load - not OSPF. OSPF's simplicity (single metric) contrasts with EIGRP's configurable composite metric.

Topics

#OSPF#cost metric#bandwidth#route selection

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