1. CCNA 2 v3.1 Module 11 Access Control Lists (ACLs)

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4. Objectives

5. What are ACLs?
ACLs are lists of conditions used to test network traffic that tries to travel across a router interface. These lists tell the router what types of packets to accept or deny.

6. How ACLs Work

7. Protocols with ACLs Specified by Numbers

8. Creating ACLs

9. The Function of a Wildcard Mask

10. Verifying ACLs
There are many show commands that will verify the content and placement of ACLs on the router.
show ip interface
show access-lists
Show running-config

11. Standard ACLs

12. Extended ACLs

13. Named ACLs

14. Placing ACLs Standard ACLs should be placed close to the destination.
Extended ACLs should be placed close to the source.

15. Firewalls
A firewall is an architectural structure that exists between the user and the outside world to protect the internal network from intruders.

16. Restricting Virtual Terminal Access

17. Summary