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Chapter 1
Planning a Network Topology
1-41
■
TCP/IP is the industry standard protocol suite for the network and transport
layers
and is suitable for most network installations. Other protocols, such as IPX
and
NetBEUI, are useful only in special situations.
■
Creating a blueprint of a network’s infrastructure is an essential part of
the plan-
ning process. The blueprint should specify the locations of all major
network com-
ponents, including cables, hubs and other connection devices, computers, and
peripherals.
Exam Highlights
Before taking the exam, review the key points and terms that are presented
below to
help you identify topics you need to review. Return to the lessons for
additional prac-
tice, and review the “Further Reading” sections in Part 2 for pointers to
more informa-
tion about topics covering the exam objectives.
Key Points
■
The OSI reference model is a standard tool for network planning,
implementation,
and troubleshooting. You must understand the functions of each of the
model’s
seven layers.
■
A network’s infrastructure consists of physical and logical components,
catego-
rized as hardware and software. You should be familiar with the standard
compo-
nents of data networks, how they function, and how they connect.
■
Planning a network topology consists of selecting an appropriate network
medium, deciding on the speed at which the network should run, selecting a
data-link layer protocol, and then blueprinting the locations of all the
network’s
components.
■
Planning the physical placement of network resources consists of selecting
loca-
tions for workstations and servers, diagramming cable locations, and
creating
secured facilities for routers, hubs, and other connection devices.
■
Selecting the protocols for a network is a matter of evaluating the needs of
the
network users and balancing them against the requirements specified by the
management.
Key Terms
Attenuation The tendency of a signal to weaken as it travels along a medium.
The
longer the distance traveled, the more the signal attenuates. All signals
attenuate
as they travel along a network medium, but different media are subject to
differ-
ent degrees of attenuation. Signals on copper-based cables such as UTP
attenuate
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