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Chapter 7 study guide 233

Chapter 7 study guide 233 - Chapter 7 Wireless Networks I...

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Chapter 7: Wireless Networks I What do we mean when we say that a wireless LAN (WLAN) operates at a higher frequency than an FM radio station? What is the difference between an omnidirectional antenna and a dish/directional antenna. Omnidirectional- transmit signals equally strongly in all directions and receive incoming signals equally well from all directions. Good for short distances. Dish Antenna- Point a particular direction, allows them to focus stronger outgoing signals in that direction for the same power and to receive weaker incoming signals from that direction. Good for long distances Which one would you prefer for a home network? Which one would you prefer if you were linking two building networks together using a wireless bridge? What is wireless propagation? Describe the following potential wireless propagation problems: free space attenuation absorptive attenuation- when radio signal travels, it is absorbed by the air, molecules, plants, and other things it passes through. Especially bad in moist air. Bad for longer
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