Forwards packets, including routing through intermediate routers

Gives transparent transfer of data between end users

Provides the rules for framing, converting electrical signals to data

Handles the physics of getting a message from one device to another

Cybersecurity requirements specification and detailed cyber risk assessment

Cybersecurity requirements specification and allocation of IACS assets to zones and conduits

Detailed cyber risk assessment and cybersecurity maintenance, monitoring, and management of change

Allocation of IACS assets to zones and conduits, and detailed cyber risk assessment

Capability security level

Achieved security level

Design security level

Target security level

Establish the risk tolerance and select common countermeasures.

Establish the risk tolerance and update the business continuity plan.

Select common countermeasures and update the business continuity plan.

Select common countermeasures and collaborate with stakeholders.

Individual preferences

Common needs for large groups

Specific roles

System complexity