What is it?  - Windows Azure and Virtual Networking -

http://blogs.technet.com/b/bobh/archive/2013/01/09/windows-azure-and-virtual-networking-what-it-is-31-days-of-windows-servers-vms-in-the-cloud-part-9-of-31.aspx

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In case you missed any of the series here is a list to all of the articles: http://aka.ms/31azure