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<DIV dir=ltr align=left><SPAN class=814445714-11122006><FONT face=Arial
color=#0000ff size=2>Zeeshan - understanding the Cisco OSI model will help you
conceptualize.....http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/introint.htm</FONT></SPAN></DIV>
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color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=814445714-11122006><FONT face=Arial
color=#0000ff size=2>There is a good graphic depiction here <A
href="http://www.certificationzone.com/cisco/images/graphics/VP/IPTT/WP1/VP-IPTT-WP1-01.gif">http://www.certificationzone.com/cisco/images/graphics/VP/IPTT/WP1/VP-IPTT-WP1-01.gif</A>
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</FONT></SPAN></DIV>
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color=#0000ff size=2></FONT></SPAN> </DIV>
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color=#0000ff size=2></FONT></SPAN> </DIV>
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<DIV align=left><FONT face=Arial size=2>Cory Andrews</FONT></DIV>
<DIV> </DIV><BR>
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<FONT face=Tahoma size=2><B>From:</B> asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] <B>On Behalf Of </B>Zeeshan
Zakaria<BR><B>Sent:</B> Monday, December 11, 2006 9:54 AM<BR><B>To:</B> Asterisk
Users Mailing List - Non-Commercial Discussion<BR><B>Subject:</B> Re:
[asterisk-users] Re: Recommendations for QoS, PoE Switches<BR></FONT><BR></DIV>
<DIV></DIV>What's the price for these HP switches?<BR><BR>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. </BODY></HTML>