Larger companies have been able to keep their networks clean and their employees out of the back alleys of cyberspace with all-in-one devices that combine multiple layers of security capable of screening every byte traveling between the internal network and the Web.

However, these UTM appliances cost several thousand dollars and require a crack IT team to install and manage them properly. Small-business owners who can't afford them have often been forced to take a more piecemeal approach - a spam filter here, an antivirus package there - and hope they can keep up with the frequent updates those technologies require.

At CNN.

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