H12-821_V1.0 · Question #135
In the OSPF routing protocol, the unit of bandwidth-reference command is Mbps.
The correct answer is A. TRUE. Option A (TRUE) is correct because OSPF's bandwidth-reference command, used to calculate interface costs via the formula cost = reference-bandwidth / interface-bandwidth, accepts its value in Mbps (megabits per second). The default reference bandwidth is 100 Mbps, which is why…
Question
Options
- ATRUE
- BFALSE
How the community answered
(38 responses)- A76% (29)
- B24% (9)
Explanation
Option A (TRUE) is correct because OSPF's bandwidth-reference command, used to calculate interface costs via the formula cost = reference-bandwidth / interface-bandwidth, accepts its value in Mbps (megabits per second). The default reference bandwidth is 100 Mbps, which is why Fast Ethernet (100 Mbps) gets a cost of 1 by default. Option B (FALSE) is wrong because the unit is definitively Mbps - not Kbps, Gbps, or bytes - as specified in Cisco IOS documentation and the OSPF standard implementation.
Memory tip: Think "100 Mbps = cost 1" - the default reference bandwidth of 100 maps directly to Fast Ethernet, and that number is in Mbps, just like your internet speed is measured in Mbps.
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