An access-list is a list of rules, usually held on network devices such as switches, routers or firewalls, that matches network traffic. The specific term 'access-list' is used in the context of Cisco devices, although the concept of an 'access list' is more generic.

The purpose of the list is to match traffic so that the device can behave in a particular way. It may be as simple as permitting or dropping packets based on the list, or it may involve more complex operations such as applying a rate-limiting, or QoS policy to the matched traffic.

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