Introducing Windows Server 2008 - MCTS Guide to Microsoft Windows Server 2008 Active Directory Configuration - page 21

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Figure 1-11 Role services for the File Services role

Hyper-V
Hyper-V provides the services needed to create and manage virtual machines running on a
Windows Server 2008 computer. A virtual machine is a software environment that simulates the
computer hardware an OS requires for installation. In essence, a virtual machine creates in software
all the hardware you find on a computer, including BIOS, disk controllers, hard drives, CD/DVD
drives, serial ports, USB ports, RAM, network interfaces, video cards, and even processors. An OS
can be installed on a virtual machine by using the same methods for installing one on a physical
machine. Of course, the most common method is to insert a CD or DVD containing the OS you
want to install. With a virtual machine, however, because the CD/DVD drive is virtual, you can
simply point it to an image of the OS installation disk, thus making the physical media unnecessary.

Network Policy and Access Services
This server role provides a familiar service: Routing and Remote Access Services (RRAS), which
gives remote users access to a private network through traditional dial-up or, more commonly
today, through a virtual private network (VPN). In addition to RRAS, other role services can be
installed, including Network Policy Server (NPS), Health Registration Authority (HRA), and Host
Credential Authorization Protocol (HCAP). The primary goal of these services is to give users
secure access to network resources by using a variety of authentication and authorization protocols
that are consistent with the company's network policies. With this role installed, network admin-
istrators can use Network Access Protection (NAP). Some of these role services are described in
Chapter 12, but for more detailed coverage, refer to MCTS Guide to Configuring Microsoft
Windows Server 2008 Network Infrastructure (Course Technology, 2008, 1-4239-0236-X).

Print Services
The Print Services role enables administrators to manage access to network printers. Available
role services include Print Server, which is installed by default when you install the Print Services
role. The Internet Printing role service enables Web-based management of network printers and
the capability to print to network printers by using HTTP. In addition, the Line Printer Daemon
(LPD) role service provides print compatibility with Linux/UNIX clients. Chapter 6 covers Print
Services in more detail.