Authentication, Authorization, and Accounting
Implementing AAA within a network is very important to ensure authorized persons can access a system or network. The appropriate privileges or user rights are granted to the user, and each action performed by the user is accounted for. Let's imagine your organization has multiple network devices such as switches, routers, and firewalls at various remote branches and at headquarters locations. Your team of IT professionals is responsible for ensuring the IT infrastructure of the organization is well maintained and operating efficiently. Since each IT professional may be required to log in to various network devices, a user account containing the appropriate privileges is required for each user.
Creating individual user accounts for each user for each device is a tedious and redundant task. Imagine a user has to change their password; this means the password for the user account has to be manually changed on each individual device...