Cisco Certified Network Associate (CCNA) Practice Exam

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Which command is used to apply an ACL to a specific interface?

(config-if)#ip access-list apply ACL NAME
(config-if)#ip access-group ACL NAME in/out
(config-if)#apply access-group ACL NAME
(config-if)#interface access ACL NAME

The correct answer is: (config-if)#ip access-group ACL NAME in/out

The command used to apply an access control list (ACL) to a specific interface is formulated as placing the ACL into a specific direction, either inbound or outbound. This is denoted by the syntax that includes "ip access-group" followed by the ACL name and the direction you wish to apply it (in or out). This command effectively links the defined ACL to the particular interface at which it is configured, thereby controlling the traffic that enters or exits the interface based on the rules defined within the ACL. Utilizing the "in" option applies the ACL to the incoming traffic, whereas the "out" option governs the outgoing traffic. This is fundamental in ensuring that security policies are enforced at the interface level. The other options presented do not follow the correct syntax required for applying an ACL on an interface. Therefore, the specific structure of the command makes it definitive in practical applications for configuring network security and traffic management on Cisco devices.