Cisco Certified Network Associate (CCNA) Practice Exam

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What is the purpose of the command ip ospf cost NUMBER?

To change the default OSPF area
To influence OSPF path selection by changing cost
To configure OSPF router ID
To set OSPF hello intervals

The correct answer is: To influence OSPF path selection by changing cost

The command "ip ospf cost NUMBER" is used specifically to influence OSPF (Open Shortest Path First) path selection by altering the cost associated with a specific interface. OSPF uses cost as a metric, and it typically calculates this based on the bandwidth of the links. By adjusting the cost, network administrators can manipulate the OSPF routing algorithm to prefer certain paths over others, even if they may not be the shortest path in terms of hop count. This can be particularly useful in scenarios where load balancing or traffic engineering is required. The other options are based on OSPF functions that do not relate to directly influencing path costs. Changing the OSPF area pertains to the organizational design of OSPF networks, configuring the router ID involves setting a unique identifier for the router within OSPF, and adjusting hello intervals affects neighbor relationship establishment but does not impact path selection.