Objectives•   Describe the usage and rules of access lists•   Establish standard IP access lists•   Apply access lists to ...
What are ACLs•   ACLs are lists of conditions that are applied to traffic    traveling across a routers interface.•   Thes...
OSI Reference Model                       www.cbtvid.com                      ACL Page 3
IP Packet      From TCP/IP Protocol Suite p.180 by Behrouz Forouzan McGrawHill                                       www.c...
Types of ACL • Standard • Extended                www.cbtvid.com               ACL Page 5
How ACL Works                      Standard ACL                              Permit                              Or       ...
How to Identify different ACLs      Access List Types Number Range / Identifier      Standard              1 - 99, 1300 - ...
Scenario                             192.168.2.0/24            www.cbtvid.com           ACL Page 8
192.168.1.0     11000000.10101000.00000001.00000000192.168.1.1192.168.1.2     00000000.00000000.00000000.11111111192.168.1...
Summary• ACLs are lists of conditions that are applied to traffic  traveling across a routers interface.• Standard ACLs wo...
ReferenceMcQuerry, Stephen. (2008) Interconnecting Cisco Network Devices,Part 1 (ICND1): CCNA Exam 640-802 and ICND1 Exam ...
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ACL

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ACL

  1. 1. Objectives• Describe the usage and rules of access lists• Establish standard IP access lists• Apply access lists to interfaces• Monitor and verify access lists• Named access lists www.cbtvid.com ACL Page 1
  2. 2. What are ACLs• ACLs are lists of conditions that are applied to traffic traveling across a routers interface.• These lists tell the router what types of packets to accept or deny.• Acceptance and denial can be based on specified conditions.• ACLs can be configured at the router to control access to a network or subnet. www.cbtvid.com ACL Page 2
  3. 3. OSI Reference Model www.cbtvid.com ACL Page 3
  4. 4. IP Packet From TCP/IP Protocol Suite p.180 by Behrouz Forouzan McGrawHill www.cbtvid.com ACL Page 4
  5. 5. Types of ACL • Standard • Extended www.cbtvid.com ACL Page 5
  6. 6. How ACL Works Standard ACL Permit Or ? deny www.cbtvid.com ACL Page 6
  7. 7. How to Identify different ACLs Access List Types Number Range / Identifier Standard 1 - 99, 1300 - 1999 Extended 100 - 199, 2000 - 2600 Name Name www.cbtvid.com ACL Page 7
  8. 8. Scenario 192.168.2.0/24 www.cbtvid.com ACL Page 8
  9. 9. 192.168.1.0 11000000.10101000.00000001.00000000192.168.1.1192.168.1.2 00000000.00000000.00000000.11111111192.168.1.3 Wildcard mask 0.0.0.255.. Subnet mask 255.255.255.0..192.168.1.254 www.cbtvid.com ACL Page 9
  10. 10. Summary• ACLs are lists of conditions that are applied to traffic traveling across a routers interface.• Standard ACLs work based on source IP address.• Standard ACLs should be configured on the router and interface closest to the destination. www.cbtvid.com ACL Page 10
  11. 11. ReferenceMcQuerry, Stephen. (2008) Interconnecting Cisco Network Devices,Part 1 (ICND1): CCNA Exam 640-802 and ICND1 Exam 640-822, 2ndEdition Cisco Press ISBN: 978-1-58705-462-4Forouzan, Behrouz. (2009). Tcp/ip protocol suite. McGrawHill.ISBN: 978-0070166783Kelly Cannon, Kelly Caudle ,Anthony V. Chiarella (2009) CCNA Guideto Cisco Networking Fundamentals, International Edition, 4th EditionISBN-13:9780840031198 www.cbtvid.com ACL Page 11

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