Every administrator these days has already built strong defences against hackers and virus attacks. So why do the viruses and hackers continue to get through? Anti-virus and IDS systems are designed to prevent the incursion of known viruses and attacks. The hackers have the same access to all the threat bulletins and Windows patches that you have and they are always looking for new vulnerabilities. In short, your firewalls and operating systems often won't get a patch until the damage is already done.

By Ian Cummins at BIOS.

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