These are physical or electronic systems designed to control who has access to a network. The simplest example of a physical access control system is a door which can be locked, limiting people to one side of the door or the other. The commonly used system is a physical access control system, integrated with an electronic one. For example, a door may be unlocked with a swipe card, an RFID keyfob, or through biometric means. A card access control system is one of the most common types of electronic door control, using a card with a magnetic stripe which can be swiped through a reader on the door.
Depending on the size of the organization and the varying levels of security which may be necessary, physical access control systems within a building may be linked or standardized, as is the case with a key which opens all of the doors in a building, or each access point may be controlled individually.
The use of electronic systems allows an administrator to precisely define access privileges for each user and also instantly update them within the system, which is much more convenient than granting or revoking key privileges.