Access layer switches operate at Layer 2 of the OSI model and provide
services such as VLAN membership. The main purpose of an
access layer switch is to allow end users into the network. An access layer
switch should provide this functionality with low cost and high port
density.
The following Cisco switches are commonly used at the access layer:
- Catalyst 1900 series
- Catalyst 2820 series
- Catalyst 2950 series
- Catalyst 4000 series
- Catalyst 5000 series
The Catalyst 1900 or 2820 series switch is an effective access device
for small or medium campus networks. The Catalyst 2950 series switch
effectively provides access for servers and users that require higher
bandwidth. This is achieved by providing Fast Ethernet capable switch ports.
The Catalyst 4000 and 5000 series switches include Gigabit Ethernet ports
and are effective access devices for a larger number of users in large
campus networks. 
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