lecture03: Internet Design Principles
http://www.warriorsofthe.net/
http://www.ietf.org/rfc/rfc3160.txt
http://www.acm.org/ubiquity/views/v6i5_simoneli.html
http://www.ietf.org/
http://www.ietf.org/rfc.html
http://www.rfc-editor.org/
http://www.wired.com/wired/archive/4.10/atm.html
http://www.geocities.com/SiliconValley/Monitor/3131/ne/osimodel.html
http://www2.rad.com/networks/1994/osi/layers.htm
http://www.webopedia.com/quick_ref/OSI_Layers.asp
http://en.wikipedia.org/wiki/OSI_model
http://www.lewistech.com/rlewis/Resources/JamesBondOSI2.aspx