Which document is crucial for understanding how a network is structured?

The network diagram is essential for understanding how a network is structured because it visually represents the arrangement of various network components, their interconnections, and the relationships between different devices and systems. This diagram provides an overview of the layout and configuration of the network, making it easier to identify potential vulnerabilities, assess risks, and understand data flows.

While other documents can provide valuable information, they typically do not illustrate the network's structure as directly as a network diagram does. The IACS Asset Inventory details the individual components and assets but does not depict their interconnections. The Cyber Criticality Assessment evaluates the importance of each asset and its role within the network but lacks a structural representation. The System Architecture Overview describes the overall design of the systems involved but may not illustrate the specific network topology or connections clearly. In summary, the network diagram is the most effective tool for visualizing and comprehending the network's layout and relationships.