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What is an Access Control List?
What is an Access Control List?
An Access Control List (ACL) is used to filter network traffic based on predefined rules. Traffic is allowed or denied based on IP addresses, MAC addresses, protocols, or port numbers. ACLs are applied to routers, switches, and firewalls to improve security. Standard ACLs filter traffic using source IP addresses, while extended ACLs use multiple criteria. Unauthorized access is blocked, while legitimate traffic is permitted to reach its destination. Network performance and security are enhanced by controlling data flow efficiently.
Example Scenario: Restricting built-in servers on a switch to only be accessible on Port 1.
A network switch is configured to have ACL to restrict access to HTTP, HTTPS, SSH, and Telnet services. The ACL allows only traffic from Port 1 to reach servers using these protocols. If a device on Port 2 attempts to connect to an HTTP or SSH server, the request is blocked. However, devices on Port 1 can successfully communicate with web and remote management servers. This ensures that only authorized devices access critical services, enhancing network security.