I once saw a football game where the defensive tackle was just not holding up his game. Runs kept going through his assigned slot, and the offense hammered that side relentlessly. Fortunately for him, they shifted the defense so the middle linebackers could plug up the hole, effectively nullifying any plays going to that side.

This article does go over many benefits of Unified Threat Management (UTM) firewalls - all your antivirus, malware, etc. detection and blocking in one layer. The aim of this seems to be ease of management. However, I"m reminded of UTM firewalls the same as that offensive line I previously mentioned. What's the use of an all-star lineup if there's a hole to be exploited? This is where "security in layers" shows its strengths - difficulty of setup is just one sacrifice you pay in order to have a secure system.

The link for this article located at Network World is no longer available.