Cisco Certified Network Associate (CCNA) Practice Exam

How do you modify a named ACL?

1. (config)#ip access-list standard/extended ACL NAME

2. (config-std/nacl)#modify ACL STATEMENT NUMBER AND THEN ACL STATEMENT

3. (config)#modify access-list standard/extended ACL NAME

4. (config)#update access-list ACL NAME

The correct answer is: (config)#ip access-list standard/extended ACL NAME

To modify a named access control list (ACL), the correct format is to enter the global configuration mode and then specify the type of ACL—standard or extended—followed by the name of the ACL you intend to modify. The command `ip access-list standard/extended ACL NAME` allows you to enter the named ACL's configuration mode, where you can then add, remove, or alter ACL statements according to your needs. This approach is essential for effective network traffic management, as it permits administrators to fine-tune access permissions for different traffic patterns or security requirements. The ability to modify an existing ACL rather than creating a new one promotes efficient management of the ACLs in a router or switch. In contrast, the other choices provide incorrect syntax or concepts for modifying an ACL. Some may imply a procedure that does not exist in Cisco IOS, such as modifying a list in ways that are not supported, creating unnecessary complexity in ACL management. Thus, understanding the correct command structure is key to performing ACL modifications effectively.