Datacenter access is controlled with proximity badges that record all entries and exits from the datacenter. The access records are used to identify which staff members accessed the data center in…

Password reuse is a credential management risk for logical systems and has no bearing on who physically enters the datacenter.

Phishing targets credentials via deceptive communications and does not directly enable unauthorized physical entry into a badge-controlled facility.

Social engineering is a broad category; while tailgating is technically a form of it, the specific physical-access threat that undermines badge logging is tailgating itself.

The proximity badge system relies on every entrant scanning their badge to create an audit trail. Tailgating circumvents this entirely because the unauthorized individual physically enters behind a badge holder without triggering their own badge read. If tailgating is not prevented, the access log cannot reliably identify everyone who was present during a theft.