Use this skill when reviewing Cisco IOS or IOS-XE snippets, building a change-window checklist, or explaining how to collect evidence from a router or switch without making the incident worse. - Reviewing IOS or IOS-XE configuration before a planned change. - Choosing read-only `show` commands for troubleshooting. - Checking ACL wildcard masks and interface direction. - Explaining global, interface, routing process, and line configuration modes. - Verifying that a change landed in running config and was saved intentionally.