b'TopicsHigh-Entrance PublicSemi-publicOperationsSecuritysecurity zone zone zone zone zoneSecurity controlSecurity zoningThe security zoning of a building often consists of five zones:1. Public zone: accessible to general public (e.g. entrance and lobby)2. Semi-public zone: accessible to visitors with access cards (e.g. conference area)3. Operation zone: accessible to employees (e.g. office floors)4. Security zone: accessible to specific employees/contractors (e.g. server room)5. High-security zone: same as (4), but with stricter identity verification (e.g. crisis room)Ideally the different zones are embedded in one another, thereby increasing the protection with each new zone and delaying the time between a break-in and the breaching of a critical area.118'