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Lesson 2
Selecting Data-Link Layer Protocols
1-23
For example, a typical network infrastructure design might call for
100Base-TX
Fast Ethernet on all the standard workstation LANs. For the backbone network
that connects all the LANs, a faster network with a longer cable span might
be
necessary. This is a good place for Gigabit Ethernet using fiber-optic
cable. For a
group of portable computers that are frequently moved to different
locations,
IEEE 802.11b can provide the flexibility needed.
Practice: Choosing an Ethernet Variant
For each of the following situations, specify which Ethernet variation you
would rec-
ommend and provide a reason for your selection. You can find answers to the
ques-
tions in the “Questions and Answers” section at the end of this chapter.
1. A legacy Category 3 UTP cable installation.
2. A high-bandwidth backbone network 1,000 meters long.
3. A Fast Ethernet LAN connecting 50 workstations in a factory environment
with
large amounts of electromagnetic interference.
Lesson Review
The following questions are intended to reinforce key information presented
in this
lesson. If you are unable to answer a question, review the lesson materials
and try the
question again. You can find answers to the questions in the “Questions and
Answers”
section at the end of this chapter.
1. Data-link layer protocols used on LANs, such as Ethernet, include
functions asso-
ciated with which two layers of the OSI reference model?
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