Cisco Certified Network Associate (CCNA) Practice Exam

Which command is used to configure bandwidth that influences path selection on an IPv6 EIGRP router?

1. (config-if)#bandwidth NUMBER delay NUMBER

2. (config-router)#router-id ROUTER ID

3. (config)#ipv6 unicast-routing

4. (config-router)#maximum-paths NUMBER

The correct answer is: (config-if)#bandwidth NUMBER delay NUMBER

The command that is used to configure bandwidth which influences path selection on an IPv6 EIGRP router is the one that allows you to adjust the bandwidth and delay values on an interface. When you configure the bandwidth on an interface, it affects the EIGRP metric calculation, especially when it comes to selecting the optimal path to a destination. EIGRP primarily uses bandwidth and delay as its metrics. In this case, setting the bandwidth through the interface configuration can change the EIGRP calculations for the best path selection. This can be particularly important in scenarios where the actual speed of the link is different from the default values used by EIGRP. By manually configuring the bandwidth, you can influence the path EIGRP chooses when there are multiple possible routes to a destination. The other commands provided do not directly affect the bandwidth calculation. For instance, configuring a router ID is important for EIGRP to identify itself, and enabling IPv6 unicast routing is necessary for IPv6 functionality, but these do not influence path selection metrics based on bandwidth. Defining the maximum paths setting can allow EIGRP to load-balance traffic across multiple routes, but it does not alter the metrics themselves based on bandwidth. Thus, the first command is the