Chapter 7 Wireless
VMG1312-B Series User’s Guide
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• An “ infrastructure” type of network has one or m ore access point s and one or m ore wireless
clients. The wireless clients connect t o the access point s.
• An “ ad-hoc” type of net work is one in w hich there is no access point . Wireless clients connect t o
one anot her in or der t o exchange inform ation.
The following figure provides an exam ple of a wireless network.
Figure 43 Exam ple of a Wireless Network
The wireless net w ork is the part in t he blue circle. I n this wireless network, devices A and B use t he
access point ( AP) to interact wit h the ot her devices (such as the print er) or wit h t he I nt ernet. Your
Device is the AP.
Every wireless network m ust follow t hese basic guidelines.
• Every device in the sam e wireless network m ust use the sam e SSI D.
The SSI D is t he nam e of the wireless network. I t stands for Service Set I Dentifier.
• I f t wo wireless net works overlap, they should use a different channel.
Like radio st ations or t elevision channels, each wireless network uses a specific channel, or
frequency, t o send and receive inform ation.
• Every device in the sam e wireless network m ust use securit y com patible wit h t he AP.
Securit y stops unaut horized devices from using the wireless network. I t can also prot ect the
inform at ion t hat is sent in t he wireless net work.
Radio Channels
I n t he radio spectrum , there are certain frequency bands allocated for unlicensed, civilian use. For
the purposes of wireless net working, t hese bands are divided into num erous channels. This allows a
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