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Lesson 1
Windows Server 2003 and the Network Infrastructure
1-7
Exam Tip Familiarity with the physical infrastructure of a network is
prerequisite knowledge
!
for the 70-293 exam. You should be familiar with the functions of all the
basic hardware com-
ponents and how to connect them to construct a network.
Logical Infrastructure
A network’s logical infrastructure comprises the many software elements that
connect,
manage, and secure hosts on the network. The logical infrastructure allows
communi-
cation between computers over the pathways described in the physical
topology. The
logical infrastructure of a network consists of both abstract software
elements, such as
networking protocols, and concrete elements, such as specific software
products.
For example, when designing the infrastructure for a medium-to-large
network, you
will probably decide to use the TCP/IP protocols for network and
transport-layer com-
munications. At this stage of planning, TCP/IP is considered to be an
abstract element
because you can implement the protocols using any one of several software
products.
After deciding on the abstract element, you must also select the concrete
element you
will use to implement that abstract element. After deciding to use TCP/IP,
for example,
you might then select the TCP/IP implementation found in the Microsoft
Windows
operating systems.
In addition to basic communication protocols such as TCP/IP, the abstract
elements of
the logical infrastructure can include security technologies such as digital
certificates
and the IP Security (IPSec) protocols. Various types of concrete elements
can imple-
ment these abstract elements.
Planning For a network based on Windows Server 2003, most concrete elements
needed
in a typical infrastructure are realized in the operating system itself. In
other cases, you
might need to implement protocols and abstract security components as
separate software
products.
Windows Server 2003 includes a large number of optional protocols and
services, and
deciding which of those protocols and services you want to use is also part
of the log-
ical infrastructure design process. In some cases, you might decide to use a
third-party
product rather than an operating system component. For example, Windows
Server
2003 includes a backup software program of its own, but you might decide one
of the
other network backup software products on the market offers additional
features that
you need.
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