Chapter 7. Adding Local (Network) Roadways for No
Extra Money
What You Will Learn
After reading this chapter, you should be able to
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Define the terms LAN, VLAN, and broadcast domain
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Compare and contrast the concept of a physical LAN and a
virtual LAN
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Explain how a single switch operates when multiple VLANs are
present
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List several reasons for wanting to use VLANs
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Explain the need for VLAN trunking, and list the two options
for trunking on Ethernet
At this point in your reading, you already have a pretty
detailed view of how LANs work. You can buy some network interface cards (NICs)
and install them in some computers, cable each NIC to a switch, and you've
created a LAN. As long as the PCs have some networking software on themand most
operating systems today include TCP/IPyou're all set to use the network.
As it turns out, there are many reasons why you would want more
than one LAN. Regardless of the reason, you can create another LAN by buying
more NICs, more cables, and more switches. However, there's a better way to
create more LANs by using virtual LANs (VLANs).
In this chapter, you will read about physical LANs, with
particular attention to some concepts that will help you understand VLANs. Then,
you'll read about VLANs and how they are created. Along the way, you'll learn
some of the reasons why you might want to use VLANs.
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