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1-24
Chapter 1
Planning a Network Topology
2. What phenomenon never occurs on a properly functioning Token Ring network
but is a normal occurrence on an Ethernet network?
3. List two advantages and two disadvantages of using fiber-optic cable to
build a
network.
Lesson Summary
■
The OSI reference model splits the network communications process into seven
layers—physical, data-link, network, transport, session, presentation, and
applica-
tion—which isolate the various functions performed by the networking
protocols.
■
Selecting a data-link layer protocol is primarily a matter of choosing an
appropri-
ate network medium. Unshielded twisted pair, fiber-optic, and wireless media
all
have benefits and drawbacks making them suitable for some installations and
unsuitable for others.
■
Transmission speed is an important criterion in selecting the data-link
layer proto-
col. There are various types of Ethernet that run at 10, 100, and 1,000
Mbps.
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