Northcutt S et al. <br/><br/>
"Inside Network Perimeter Security: The Definitive Guide to Firewalls, VPNs, Routers and Intrusion Detection Systems" 

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 - 678 
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<br/><br/><br/>English 
<br/><br/><label>ISBN: </label>81-7808-761-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>"Computer Science, "Networks