A network diagram is not useful because it has enough icons. It is useful when another person can look at it and understand where the CJIS environment is, what connects to it, and how information moves through the real agency.
Start with the purpose of the diagram
The diagram should help the auditor and your own staff understand the technical environment that processes, stores, or transmits CJI. That usually means the drawing needs to communicate systems, network segments or boundaries, relevant locations, major connectivity, and important external or vendor paths in a way that is understandable without the original network engineer narrating every line.
Show the scope that matters
If your organization has a large general-purpose network, the answer is not necessarily to put every printer and conference-room television on one giant picture. The diagram should make the CJIS-relevant portion clear: where CJI systems live, how users reach them, where protected boundaries exist, and which infrastructure or external services materially affect those paths.
Do not forget the paths that leave your building
Remote access, cloud services, hosted applications, vendor support, VPNs, mobile connectivity, and inter-agency connections are easy to underrepresent because they are not physically visible in the network closet. If an external path can reach CJI or a CJIS-connected system, it deserves deliberate attention in your scope documentation.
Make the diagram current enough to trust
A beautiful diagram from three years ago can be worse than a plain current one. Equipment changes, buildings are renovated, network segments move, vendors are replaced, and remote-access methods evolve. Put the diagram into a review cycle rather than recreating it only because the audit notice arrived.
Verify exact presentation requirements against the current audit material
Specific required markings, dates, labels, or elements can change. Do not rely on a screenshot of somebody else's old diagram or an archived “what to expect” document. Use the current Texas DPS CJIS documents and the current technical audit framework when you decide what must appear on the final audit copy.
Use the diagram as a self-audit
The most valuable moment may be before the auditor ever sees it. Ask whether the diagram exposes anything you have been assuming: an unsegmented path, an unknown vendor connection, a forgotten building, an unsupported switch, a wireless route, or a system whose CJI relationship nobody can clearly explain. The diagram is not merely evidence. It can tell on you—and that is useful before audit day.