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1-6
Chapter 1
Planning a Network Topology
nication protocols common to all network operating systems, the Microsoft
Windows
Server 2003 family also includes a collection of applications and services
that imple-
ment important security and special communications capabilities on the
network.
The significance of the network infrastructure does not end when the
construction of
the network is complete, however. The personnel responsible for maintaining
the net-
work must have an intimate knowledge of the network’s infrastructure to
expand the
network, perform upgrades, and troubleshoot problems. The 70-293 exam tests
your
knowledge of how the infrastructure affects the planning, implementation,
and main-
tenance of a medium-to-large network, and of how Windows Server 2003
functions as
a part of that infrastructure.
Physical Infrastructure
A network’s physical infrastructure is its topology—the physical design of
the net-
work—along with hardware components such as cabling, routers, switches,
hubs, serv-
ers, and workstations. The hardware you select when planning the network’s
physical
infrastructure is frequently dependent on elements of the network’s logical
infrastruc-
ture. For example, if you decide to use Ethernet for your network’s
data-link layer pro-
tocol, you are limited to certain specific cable types supported by
Ethernet, and the
network’s connectivity components—hubs, routers, and switches—must be
designed
for use with Ethernet as well.
For a small network, the physical infrastructure can be very
simple—computers, a hub,
and a few cables are generally all you need. For medium-to-large networks,
however,
the physical infrastructure can be extraordinarily complex. In addition to a
large fleet of
computers, a vast system of cables, and multiple interconnected hubs, the
network
might require routers or switches to connect segments, plus the additional
components
needed to support Internet connections, remote client access, wide area
connections to
other sites, or wireless connectivity.
The hardware used to implement these additional technologies is various and
always
relates to the network’s logical infrastructure. For example, to connect the
Ethernet
local area network (LAN) in the company headquarters to the Ethernet LAN in
a branch
office, you must choose a different data-link layer protocol for the wide
area network
(WAN) connection (such as Point-to-Point Protocol), as well as a different
network
medium (such as a dial-up or a T-1 connection), and you must be sure that
the hard-
ware and software on both LANs support the WAN technology you choose.
See Also For more information on WAN connections, see Lesson 1 in Chapter 3,
“Planning
Internet Connectivity,” and Lesson 1 in Chapter 5, “Using Routing and Remote
Access.”
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