Ensuring that industrial networks are secure is not easy. The threats industrial networks face are constantly changing and evolving, which is why constant monitoring is essential in order to ensure industrial networks remain secure from cyber threats. This white paper will start by examining some of the key challenges system operators must consider and overcome in order to design, deploy, and maintain secure industrial networks. After the challenges have been presented, the three criteria that are deemed necessary in order to ramp up the security of industrial networks will be considered in detail. By the end of this paper, readers will have a good understanding of the necessary steps that should be taken in order to design, manage, and maintain industrial networks and devices.