The Five Key Controls
Firewalls & Gateways
Use devices designed to prevent unauthorised access to or from private networks.
Ensure that systems are configured in the most secure way for the needs of the organisation.
Ensure only those who should have access to systems are provided access at an appropriate level.
Ensure that virus and malware protection is installed and up to date.
Ensure the latest supported version of applications is used, and all patches and updates applied.