A system of interconnected computers and computerized peripherals such as printers is called computer network. This interconnection among computers facilitates, information sharing among them. Computer may connect to each other by either wired or wireless media. Access control is a method of limiting access to a system or physical or virtual resources. It is a process by which users can access and are granted certain prerogative to systems, resources or information. Access control is a security technique that has control over who can view different aspects, what can be viewed and who can use resources in a computing environment. It is a fundamental concept in security that reduces risk to the business or organisation.