Network World asked security pros to name their No. 1, must-have, go-to security tool. We received responses from industry analysts, enterprise security practitioners, academics, and members of industry associations.

Many of the experts we interviewed pointed out that there is no silver bullet when it comes to security, so your best bet is a defense in depth strategy that combines as many of these approaches as possible.

Ron Woerner, director of CyberSecurity Studies at Bellevue University: “There are certain things all network, IT, and security professionals should have in their toolbag. The most important is knowledge; i.e., where to learn more about a particular topic, technique, or tool. It’s impossible to know everything; so focus on where to get quality instruction and information”.

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