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

Which parameter or parameters are used to calculate OSPF cost in Cisco routers?
A .  Bandwidth
B .  Bandwidth and Delay
C .  Bandwidth, Delay, and MTU
D .  Bandwidth, MTU, Reliability, Delay, and Load

View Answer

Answer: A

Explanation:http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.shtml#t6 OSPF Cost The cost (also called metric) of an interface in OSPF is an indication of the overhead required to send packets across a certain interface. The cost of an interface is inversely proportional to the bandwidth of that interface. A higher bandwidth indicates a lower cost. There is more overhead (higher cost) and time delays involved in crossing a 56k serial line than crossing a 10M Ethernet line. The formula used to calculate the cost is: Cost= 10000 0000/bandwidth in bps

For example, it will cost 10 EXP8/10 EXP7 = 10 to cross a 10M Ethernet line and will cost 10 EXP8/1544000 =64 to cross a T1 line. By default, the cost of an interface is calculated based on the bandwidth; you can force the cost of an interface with the ip ospf cost <value> interface sub configuration mode command.