After you change the IP address on an IOS XR router, you cannot ping the new address.
Which step did you forget to complete?
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A. B. C. D.A.
The correct answer is A. commit the configuration.
IOS XR is a distributed operating system that is designed for high-performance routing on Cisco routers. When a change is made to the IOS XR configuration, the changes are not applied immediately. Instead, the changes are staged in a candidate configuration, and the operator must explicitly commit the changes to make them effective.
In this scenario, the operator changed the IP address on an IOS XR router but could not ping the new address. This indicates that the new IP address has not been applied to the router's interface, and the old IP address is still in use. To resolve this issue, the operator must commit the configuration, which will apply the changes and activate the new IP address.
Rolling back the configuration (answer B) would undo the change and restore the previous IP address, which is not the desired outcome. Merging the configuration (answer C) is a process of combining multiple configuration files, which is not relevant to this scenario. Saving the running configuration (answer D) will not activate the new IP address, as it only saves the current configuration to the startup configuration file.