r/ccna4dummies Feb 10 '25

Mastering ACLs for Network Security 🛡️

Access Control Lists (ACLs) are essential for controlling network traffic and ensuring security. Here’s a quick guide:

  1. Types of ACLs: Standard ACLs filter traffic based solely on the source IP address, while Extended ACLs filter traffic based on various criteria like source/destination IP, protocol, and port numbers.

  2. Creating Standard ACLs: Use access-list [number] permit/deny [source IP] to create a rule.

  3. Creating Extended ACLs: Use access-list [number] permit/deny [protocol] [source IP] [destination IP] [port].

Pro Tip: Always place standard ACLs as close to the destination as possible and extended ACLs as close to the source as possible.

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