Applying a named ACL inbound You created a named ACL called 'Blocksales'. Which command correctly applies this ACL to packets entering interface Serial0?

Introduction / Context:
Named ACLs offer readability and easier maintenance than numbered lists. The method to apply them to an interface is exactly the same as for numbered ACLs: use ip access-group with the ACL name and the direction (in or out) in interface configuration mode.

Given Data / Assumptions:

• A named IPv4 ACL called Blocksales exists.
• We want to apply it inbound on interface Serial0.
• Classic IOS syntax is in use.

Concept / Approach:

Command pattern: interface s0 then ip access-group Blocksales in. The keyword is identical for numbered or named IPv4 ACLs. IPv6 named ACLs use a different application command (ipv6 traffic-filter).

Step-by-Step Solution:

Verification / Alternative check:

Use show run interface serial 0 to ensure the ACL is bound, then test with traffic from a blocked host to see counter increments.

Why Other Options Are Wrong:

• Options A and B reference numeric ACL 110; our ACL is named.
• Options D and E are not valid IOS command syntaxes.

Common Pitfalls:

• Applying the ACL in the wrong direction; “in” means packets entering the interface.
• Forgetting that ACL processing is top-down; order entries carefully.

Final Answer:

(config-if)# ip access-group Blocksales in