What command can be used to view which ACLs are applied to an interface?

The command that can be used to view which ACLs (Access Control Lists) are applied to an interface is "show ip interface interface-id." This command provides detailed information about the specified interface, including the ACLs that are currently applied to it for both inbound and outbound traffic. By using this command, you can quickly assess the security policies that affect the traffic for that particular interface.

This command is specifically designed to target an interface and give a clear overview of its status and configured properties, including any associated ACLs. In a practical scenario, network administrators rely on this command to verify security settings or troubleshoot access-related issues.

In contrast, while "show access-list" lists the ACLs that have been defined on the device, it does not specify which ones are applied to a particular interface. "show running-config" presents the entire current configuration of the device, which includes ACLs among many other configurations, but it can be cumbersome to sift through if you are only interested in the ACLs applied to a specific interface. The "display interface acl" command does not exist in Cisco's IOS and is not valid.