ECE495 Chapter Notes - Chapter 1: Cisco Ios, Integrated Services Digital Network, Access Control

• School: University of Alberta
• Department: Electrical and Computer Engineering
• Course: ECE495
• Professor: mint

Document Summary

Access control lists (acls) can be used for two purposes on cisco devices: to filter traffic, to identify traffic. Access lists are a set of rules, organized in a rule table. Each rule or line in an access-list provides a condition, either permit or deny: when using an access-list to filter traffic, a permit statement is used to. It is thus interpreted as a true/false statement. Filtering traffic is the primary use of access lists. When filtering traffic, access lists are applied on interfaces. As a packet passes through a device, the top line of the rule list is checked first, and the device continues to go down the list until a match is made. Once a match is made, the packet is either permitted or denied. There is an implicit deny all" at the end of all access lists. You don"t create it, and you can"t delete it.