Term ...edge of the network

Hi,
I usually read this term 'The switch should be at the edge of the network' but not too sure what it means ...
My understanding is that the switch should be the distribution switch or something of this sort. Is this correct, if no, please help to explain.
Thank you.
-SN-

Hi,
Typically, the "edge" of the network is referred to as the point that host devices connect to the network.
When speaking in terms of a layered campus network design, we usually refer to three layers, the core, distribution, and access layer. The access layer is logically equivalent to the "edge."
Here's a PPT that covers the principles of Multilayer Campus design.
http://www.cisco.com/application/vnd.ms-powerpoint/en/us/guest/netsol/ns432/c649/cdccont_0900aecd802e9b1a.ppt
HTH,
Bobby

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