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Lesson 1
Windows Server 2003 and the Network Infrastructure
1-5
Lesson 1: Windows Server 2003 and the Network
Infrastructure
A network infrastructure is a set of physical and logical components that
provide con-
nectivity, security, routing, management, access, and other integral
features on a net-
work. During a network’s planning phase, engineers select the hardware and
software
components that will compose the network infrastructure and specify the
particular
location, installation, and configuration of those components.
After this lesson, you will be able to
■ Understand the difference between a network’s physical infrastructure and
its logical
infrastructure
■ Describe the network infrastructure planning process
■ Understand the process of implementing a network infrastructure plan
■ List the tasks involved in maintaining a network infrastructure
Estimated lesson time: 15 minutes
What Is a Network Infrastructure?
In most cases, the elements of a network infrastructure are both inherited
and
designed. If you are building a network that will be connected to the
Internet, for
example, certain aspects of the network, such as the use of the TCP/IP
protocol suite,
are inherited from the Internet. Other network elements, such as the
physical layout of
basic network components, are chosen by design when the network is first
conceived
and are then inherited by later versions of the network as it evolves. It is
rare for an
engineer to have the opportunity to design a network from scratch, with no
pre-exist-
ing influences. Nearly always, the engineer must incorporate some existing
elements
into the network design, such as specific applications, operating systems,
protocols, or
hardware components.
Implementing a network infrastructure is the process of evaluating,
purchasing, and
assembling the specified components, and installing them in the manner
prescribed by
the design plan. The implementation process begins with engineers installing
the net-
work’s hardware infrastructure, including computers, cables, and
connectivity devices
such as hubs, switches, and routers, as well as printers and other
peripherals. After the
hardware is in place, the engineers install and configure the operating
systems, appli-
cations, and other software.
The operating systems running on the computers are the primary software
components
in the network infrastructure, because they incorporate the protocols and
other rou-
tines that make network communications possible. In addition to the standard
commu-
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