The Internet front door to almost every bank and financial services company in the world is guarded by two sets of firewalls defining a DMZ. Nearly every e-commerce site sits in a similar DMZ in what has become the de facto standard in Web security architecture. According to Sun Microsystems, "In today's tumultuous times, having a sound firewall/DMZ environment is your first line of defense against external threats." But I would argue that guarding the perimeter is lulling organizations into a false sense of security that results in ignoring the implementation of other security mechanisms in their applications and databases.
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