CIS Critical Security Controls v8.1 (The 18 CIS CSC)

1.1 Establish and Maintain Detailed Enterprise Asset Inventory
Establish and maintain an accurate, detailed, and up-to-date inventory of all enterprise assets with the potential to store or process data, to include: end-user devices (including portable and mobile), network devices, no-ncomputing/IoT devices, and servers. Ensure the inventory records the network address (if static), hardware address, machine name, enterprise asset owner, department for each asset, and whether the asset has been approved to connect to the network. For mobile end-user devices, MDM type tools can support this process, where appropriate. This inventory includes assets connected to the infrastructure physically, virtually, remotely, and those within cloud environments. Additionally, it includes assets that are regularly connected to the enterprise’s network infrastructure, even if they are not under control of the enterprise. Review and update the inventory of all enterprise assets bi-annually, or more frequently. 

1.2 Address Unauthorized Assets 
Ensure that a process exists to address unauthorized assets on a weekly basis. The enterprise may choose to remove the asset from the network, deny the asset from connecting remotely to the network, or quarantine the asset. 

1.3 Utilize an Active Discovery Tool
Utilize an active discovery tool to identify assets connected to the enterprise’s network. Configure the active discovery tool to execute daily, or more frequently. 

1.4 Use Dynamic Host Configuration Protocol (DHCP) Logging to Update Enterprise Asset Inventory 
Use DHCP logging on all DHCP servers or Internet Protocol (IP) address management tools to update the enterprise’s asset inventory. Review and use logs to update the enterprise’s asset inventory weekly, or more frequently 

1.5 Use a Passive Asset Discovery Tool
Use a passive discovery tool to identify assets connected to the enterprise’s network. Review and use scans to update the enterprise’s asset inventory at least weekly, or more frequently.