ACL
ACL stands for Access Control List. 👉 Definition: An ACL is a set of rules used to control which traffic is allowed or denied on a network device (like a router, switch, or firewall). In simple terms: ✅ It filters network traffic based on criteria like: IP address (who is sending or receiving the traffic) Protocol (like TCP, UDP) Port number (like HTTP port 80, FTP port 21) 🔹 Types of ACLs: 1. Standard ACL: Filters traffic only by source IP address. Simpler and used when you only care who is sending traffic. Example: Allow traffic from 192.168.1.0 network, block all else. 2. Extended ACL: Filters by source IP, destination IP, protocol type, and port numbers. More precise control. Example: Allow HTTP traffic from 192.168.1.0 to 10.0.0.5, deny everything else. 🔹 Where ACLs are used: Routers (to control incoming and outgoing traffic) Firewalls (to secure networks) Switches (to limit access to VLANs) 🔹 Why ACLs are important: ✅ Improve security by restricting unauthorized access ✅ Opti...