Extended ACL for Application-Aware Traffic Control
Filter traffic with enough precision to allow one use case and deny another intentionally.
Lab challenge
Write an ACL that solves the actual requirement instead of carpet-bombing the whole subnet.
Progression
Identify source/destination/port requirements, build the ACL in order, apply it, and test multiple traffic types.
Catalog metadata
- Bundle
- CCNA 200-301 v1.1 Foundation Lab Catalog
- Blueprint domain
- Security Fundamentals
- Blueprint objective
- Configure and verify extended ACLs based on protocol, source, and destination
- Focus
- extended acl • traffic filtering • security
- Platform
- Packet Tracer-friendly • CML-friendly • platform-neutral
- Device count
- 4
- Reference source
- Cisco CCNA 200-301 v1.1 blueprint → Configure and verify extended ACLs based on protocol, source, and destination
Prerequisites
- • basic ACL logic
- • transport ports
- • routing path awareness
Skills practiced
- • build ordered ACL entries
- • place ACL near the source
- • verify selective protocol behavior
Validation checklist
- • permitted application works
- • blocked application fails
- • unintended traffic is not broken
Task sequence
- 1Create the extended ACL entries in the correct order.
- 2Apply the ACL on the chosen interface and direction.
- 3Test permitted application traffic.
- 4Test denied application traffic.
- 5Verify counters and final reachability.
Free catalog + advanced practice
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