The SETAR Colocation Datacenter implements and observes a four-layer access control model, with strictly enforced access policies. Firstly, the data center site is surrounded by walls and fences and the entrance is guarded by security personnel. Secondly, the data center has a separate internal security desk at the entrance where visitors are identiﬁed and checked against a pre-authorized data center access list. Thirdly, all data center spaces have proximity card-controlled access on each door. Customers’ pre-authorized personnel only have access to designated areas and their own equipment racks. Lastly, all customer rack space is enclosed in access-controlled cabinets and are inaccessible to unauthorized personnel. All building and rack access is logged and the entire facility is under constant CCTV surveillance.