Information Technology Reference
In-Depth Information
Hierarchical Model
Figure 2-4
Core
(high-speed switching)
Distribution
(route policies, access lists)
Si
Access
(local/remote)
Third, the access layer provides local or remote access to the network. You use workgroup hubs
and remote access concentrators in this layer. Functions in this layer include shared and
switched bandwidth, MAC filtering, and segmentation. Remote access servers and Virtual
Private Network (VPN) aggregators also reside in this layer of the model.
Basic Internetworking Devices
Network devices can be categorized based on their function relative to the OSI model. The main
devices are the following:
•
Hubs and repeaters
•
Bridges and Layer-2 switches
•
Routers and Layer-3 switches
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