© 2004 Cisco Systems, Inc. All rights reserved.
1

Purpose of This PowerPoint
• This PowerPoint primarily consists of the Target
Indicators (TIs) of this module in CCNA version
3.1.
• It was created to give instructors a PowerPoint to take and modify as their own.
• This PowerPoint is:
NOT a study guide for the module final assessment.
NOT a study guide for the CCNA certification exam.
• Please report any mistakes you find in this
PowerPoint by using the Academy Connection
Help link.
© 2004, Cisco Systems, Inc. All rights reserved.

To Locate Instructional Resource
Materials on Academy Connection:
• Go to the Community FTP Center to locate materials created by the instructor community
• Go to the Tools section
• Go to the Alpha Preview section
• Go to the Community link under Resources
• See the resources available on the Class home page for classes you are offering
• Search http://www.cisco.com
• Contact your parent academy!
© 2004, Cisco Systems, Inc. All rights reserved.

Objectives
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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.
© 2004, Cisco Systems, Inc. All rights reserved.

How ACLs Work
© 2004, Cisco Systems, Inc. All rights reserved.

Protocols with ACLs Specified by
Numbers
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Creating ACLs
© 2004, Cisco Systems, Inc. All rights reserved.

The Function of a Wildcard Mask
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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
© 2004, Cisco Systems, Inc. All rights reserved.

Standard ACLs
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Extended ACLs
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Named ACLs
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Placing ACLs
• Standard ACLs should be placed close to the destination.
• Extended ACLs should be placed close to the source.
© 2004, Cisco Systems, Inc. All rights reserved.

Firewalls
A firewall is an architectural structure that exists between the user and the outside world to protect the internal network from intruders.
© 2004, Cisco Systems, Inc. All rights reserved.

Restricting Virtual Terminal Access
© 2004, Cisco Systems, Inc. All rights reserved.

Summary
© 2004, Cisco Systems, Inc. All rights reserved.