Make sure you have a security policy in place -— The security policy is the formal statement of rules on how security will be implemented in your organization. A security policy should define the level of security and the roles and responsibilities of users, administrators and managers.
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Make sure all of your operating systems and applications are patched with the latest service packs and hotfixes -— Keeping your systems patched will close vulnerabilities that can be exploited by hackers.
Keep an inventory of your network devices -— Develop and maintain a list of all hardware/software components, and understand which default software installations
