In addition to being highly polymorphic and therefore immune to signature based security technologies, today's threats are hidden deep within the content that's handled by client applications, and are often not visible in the packets that are used to transport that content over the network. Many network security systems, like firewalls, "next-generation firewalls", intrusion prevention systems and network forensics systems, claim to be "content aware" and to offer visibility over the content that's flowing over the network. The Content IQ Test is an easy test you can run yourself that will help you judge how "content aware" your network security system really is.