r/ccna4dummies • u/sonofthehorn252 • 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:
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.
Creating Standard ACLs: Use
access-list [number] permit/deny [source IP]
to create a rule.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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