concentric physical model (perimeter → facility → data hall → cage/rack) with escalating MFA at each boundary
4 zonesrecommendation
| Value kind | recommendation — Recommendations are design guidance, not measured facts; validate them against the project boundary conditions. |
|---|---|
| As of | 2026 |
| Source | Data Center Knowledge, "Cabinet-level controls: the final layer of physical data center security" · The Four Layers of Physical Data Center Security: perimeter, facility, server room and cabinet |
| Review | checking…review by 2026-11-23 · standard cadence |
| Recorded changes | last 2026-10-16 · 2 revisions tracked |
| Claim id | concentric-physical-model-perimeter-facility |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.