Internal service of an enterprise admission control

Many organizations have a need of exposing their internal services to its employees to facilitate work from anywhere. Being able to access these services from any device or network has always made implementing safe access control challenging. User-based access control through the use of multi-factor authentication is typically used to create access control for such purposes. Research suggests a safe network access control method for granting access to internal services to a certain group of devices that abide by the security guidelines of an organisation. It tries to improve on current port knocking techniques by making services available to a specified group of devices rather than merely a small group of people.