If device R1 has 1-Gigabit and 10-Gigabit Ethernet interfaces.
Which command do you enter so that it takes full advantage of OSPF costs?
A. R1(config-router)#auto-cost reference-bandwidth 10000
B. R1(config-router)#auto-cost reference-bandwidth 10000000000
C. R1(config-if)# ip ospf cost 10000000000
D. R1(config-if)# ip ospf cost 10000
E. R1(config-route-map)#set metric 10000
F. R1(config-route-map)#set metric 10000000000
IOU1(config-router)#auto-cost reference-bandwidth ?
The reference bandwidth in terms of Mbits per second
Maximum is 4294967 .. so 10000
A
A
A
cost = bandwidth/int bandwidth.
For 1G link, cost = 10000/1000 = 10.
For 10G link, cost = 10000/10000 = 1.
Hence there is no tie. A is correct.
A
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/command/iro-cr-book/ospf-a1.html#wp3271966058
To control how Open Shortest Path First (OSPF) calculates default metrics for the interface, use the auto-cost command in router configuration mode. To assign cost based only on the interface type, use the no form of this command.
auto-cost commandauto-cost reference-bandwidth mbps
no auto-cost reference-bandwidth
Syntax Description
reference-bandwidth mbps
Rate in Mbps (bandwidth). The range is from 1 to 4294967; the default is 100.
A would tie you to 10Gig so to take full advantage B would be the correct answer.
I am also answering it with A but correct shows B.
now the question is which answer will be correct in real exam ?
anybody have information about it ?
Should be A ?