Intrusion Prevention Systems (IPS) are among the most purchased items in data security. IPS's provide a network with some level of security and although people with some basic hacking tools and skills and usually quickly break through some of the basic IPS's out there, they still serve their purpose in most situations. Either way, the IT security professional and system / network admin in today's world needs to know about Intrusion Prevention Systems. Here is a good video we found to explain:
