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Microsoft Forefront UAG 2010 Administrator's Handbook by Ran Dolev, Erez Ben-Ari

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Preface

The Israeli department of defence has one of the strictest information security guidelines in the world, and a part of these guidelines is the requirement to have complete physical separation between the public and internal networks. A regular firewall just won't do, and this requirement gave birth to the concept of the Air-Gap, a revolutionary product for its time. The Air-Gap and e-Gap products used a physical switch that enabled the transfer of data from one network to the other, but still kept them physically disconnected. One might think of this like a shuttle transferring passengers from one land-mass to another. Whether this is more secure than advanced software-based firewalls can be debated, but the product did meet the guidelines ...

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