This example material is taken from a self-paced training guide for network administrators.

This theoretical discussion was specifically requested by customers. It is too long to include here, but you can download it and view or print it later. the file is 128K.

You will need the Adobe Acrobat Reader to use this file. You can get a free copy of this Acrobat from the Adobe website, located at:
     http://www.adobe.com .