What does the acronym ACL stand for?

The acronym ACL stands for Access Control List. This is a fundamental concept in networking and security that refers to a set of rules used to control network traffic and limit access to resources. ACLs are particularly important in routers and firewalls, as they help define which users or systems can communicate with others and under what conditions.

Access Control Lists can filter traffic based on various criteria such as IP addresses, protocols, and port numbers. By implementing ACLs, network administrators can improve security by allowing or denying specified network traffic, thus protecting sensitive data and maintaining the integrity of network resources.

Understanding ACLs is crucial for anyone studying for the CCNA certification, as they play a vital role in network security and efficiency. Other options provided do not accurately represent what ACL is recognized as in the context of networking.