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Los Medanos College

Los Medanos College. Introduction to Cisco Network Devices Mark McGregor, Instructor April, 2005. Introduction to Cisco Network Devices (ICND). What are ACLs?.

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Los Medanos College

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  1. Los Medanos College Introduction to Cisco Network Devices Mark McGregor, Instructor April, 2005

  2. Introduction to Cisco Network Devices (ICND)

  3. What are ACLs? • ACLs are lists of instructions you apply to a router's interface to tell the router what kinds of packets to accept and what kinds to deny.

  4. How ACLs Work

  5. Protocols with ACLs Specified by Numbers

  6. Creating ACLs

  7. The Function of a Wildcard Mask

  8. 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

  9. Standard ACLs

  10. Extended ACLs

  11. Named ACLs

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

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

  14. Restricting Virtual Terminal Access

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