Should there be two security guards, one to spot potential intruders to your house and another one to stop him from getting in? If you transpose this to the enterprise-network situation, we are faced with a classic debate challenging CIO's and security experts alike. To elaborate on the parallel, consider a house with state-of-the-art security systems including laser fencing, burglar alarms as well as the guard at the gate. Compare this to your network where the house symbolizes the network, the guard is the firewall, the fence is the intrusion-detection system and the burglar alarm is the anti-virus software. However, the fact is that a lot of times, these measures even when put in place, fail to prevent an attack.
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