Standard ACL vs Extended ACL: Which One Protects Your Network?
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Standard ACLs only see the source IP. Extended ACLs see everything — protocol, port,
and destination. If you're still relying on standard ACLs alone, your network may be
wide open right now. Here's the exact config method, step by step, no guesswork.
📌 In this video:
We start with a side-by-side comparison of standard and extended ACL syntax on Cisco
routers, covering both numbered and named formats. You'll learn how extended ACLs use
the access-list command with protocol fields (TCP, UDP, ICMP), source and destination
IP addresses with wildcard masks, and specific port numbers like port 80 for HTTP
traffic control. We then cover the critical placement rule: standard ACLs close to
the destination, extended ACLs close to the source — and why getting this wrong wastes
router resources. You'll also see how to apply ACLs to physical interfaces and virtual
lines using ip access-group and access-class, how to safely edit named ACL lines using
sequence numbers, and how to cleanly delete both numbered and named ACLs. Essential
knowledge for your CCNA 200-301 exam and real-world network security configuration.
⏱️ Chapters:
0:00 — Is Your Network Wide Open? Standard vs Extended ACL
0:45 — Standard ACL: Numbered Format Review
1:54 — Standard ACL: Named Format with ip access-list
2:25 — show access-lists: Checking Your ACL Config
2:50 — Extended ACL Syntax: Protocol, Port, Source, Destination
3:30 — Extended ACL Config Example: TCP Port 80 & ICMP
4:21 — ACL Placement: Close to Source vs Destination
4:45 — Applying ACLs: ip access-group & access-class
5:38 — Editing a Named ACL with Sequence Numbers
6:05 — Deleting Named and Numbered ACLs
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