They

provide users throughout an organization access to resources managed by other

computers, such as Web sites, printers, or files that are stored on different

computers.

All of the

above.

As soon as

they are properly installed and configured, roles function automatically. This

allows the computers on which they are installed to perform prescribed tasks

with limited user commands or supervision.

They

typically include their own databases that can queue user or computer requests,

or record information about network users and computers that relates to the

role. For example, Active Directory Domain Services includes a database for

storing the names and hierarchical relationships of all computers in a network.

They

describe the primary function, purpose, or use of a computer. A specific

computer can be dedicated to perform a single role that is heavily used in the

enterprise, or may perform multiple roles if each role is only lightly used in

the enterprise.