Zeeshan - understanding the Cisco OSI model will help you conceptualize.....http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_d oc/introint.htm There is a good graphic depiction here http://www.certificationzone.com/cisco/images/graphics/VP/IPTT/WP1/VP-IP TT-WP1-01.gif Using this image, starting at the bottom you have the physical layer, or "Layer 1", Data Link or "Layer 2", Network or "Layer 3", etc Cory Andrews
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Zeeshan Zakaria Sent: Monday, December 11, 2006 9:54 AM To: Asterisk Users Mailing List - Non-Commercial Discussion Subject: Re: [asterisk-users] Re: Recommendations for QoS, PoE Switches What's the price for these HP switches? And also I someone can give me a link to some document where I can read about Layer 2 and Layer 3, how they help in VoIP traffic, it'll be helpful.
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