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Question 38 of 184
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The Bottom image is Dallas not Boston. Thios image shows the same cost to reach Boston and Sanfranciso (11) as it does for San-Franciso to reach Boston (11) over the 100MBs interface. OSPF cost = reference badwidth/interface bandwidth. The costs Will be rounded up to nearest integer. So assuming we caave a reference bandwidth of 100MBS: 100/100 = 1. 100/1000 = .1 which equals 1, as Cisco routers only calculate integers. If we make reference bandwidth 1000 --> 1000/100 = cost of 10 (+ any cost through the domain) and 1000/1000 = 1
long story short, we need to change the reference bandwidth. Answer is D, because A doesnt account for the gigabit interface
By default, OSPF assigns a cost based on a reference bandwidth of 100 Mbps so, any link at 100 Mbps or more gets a cost of 1. To fix this issue, the auto-cost reference-bandwidth command needs to be used to recalibrate the OSPF cost calculation so that it can differentiate between the 100 Mbps and 1 Gbps links.