Verifying ACLs on an interface Which command tells you whether an IP ACL is applied to a particular interface and in which direction?

Introduction / Context:When troubleshooting reachability, you often need to confirm whether an ACL is bound to an interface and whether it is inbound or outbound. Cisco IOS provides several show commands; knowing the one that directly states ACL bindings saves time and avoids misinterpretation of raw ACL lines.

Given Data / Assumptions:

• IPv4 environment on Cisco IOS.
• ACLs may be numbered or named.
• We need to check binding and direction on a specific interface.

Concept / Approach:

show ip interface (or without the interface to list all) displays, among other details, whether an ACL is applied inbound or outbound: for example, “Inbound access list is …” and “Outgoing access list is …”. The generic show access-lists shows ACL contents and counters but not their interface bindings.

Step-by-Step Solution:

Verification / Alternative check:

Checking show running-config interface will also display the ip access-group lines, but show ip interface is quicker for at-a-glance status.

Why Other Options Are Wrong:

• show access-lists: no interface binding shown.
• Other commands listed are not valid IOS commands for this purpose.

Common Pitfalls:

• Looking only at ACL counters without confirming that the ACL is actually applied to the traffic path.
• Forgetting the direction semantics: “in” means packets entering the interface.

Final Answer:

show ip interface