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28 Cards in this Set
- Front
- Back
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What does DBM stand for?
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Decibels on a milliwatt scale.
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In networking what does sniff mean?
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To look for wireless signals.
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What is the typical range in meters for Wi-Fi signals?
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100 Meters.
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What does WPA stand for?
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Wi-Fi Protected Access
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What typical indoor obstacles affect Wi-Fi signal strength?
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Interior walls, furniture, appliances, people, open air.
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For typical Wi-Fi how much signal is lost per interior wall?
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5dB.
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What does SNR stand for?
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Signal-to-Noise ratio.
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What typical outdoor obstacles affect Wi-Fi signal strength?
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Open air, people, trees, rain.
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What channels are commonly usable (in the USA)?
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1, 6, and 11.
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For typical Wi-Fi how much signal is lost per floor?
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15db
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What is a site survey?
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You check for Wi-Fi signals that already exist.
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Why are some SSID's hidden?
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For additional security.
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What is the difference between dBm and dB?
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dB is a relative measure. dBm is an absolute measure.
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In what units is SNR measured?
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Decibels (dB)
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What is the legal maximum Wi-Fi signal in the USA?
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100mW
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For typical Wi-Fi, how much signal (in dB) can be used up before the SNR is too low for useful communication?
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50dB
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What does dB stand for?
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Decibels
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For typical WiFi, how much signal (in dB) is lost per meter of open air?
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1/2dB
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What does SSID stand for?
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Service Set Identifier
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What Wi-Fi security methods are commonly used?
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None, WEP, WPA, WPA2
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Why are many Wi-Fi channels not used?
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Too much signal bleed between adjacent channels (too much interference)
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How much SNR do you need for a usable connection?
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20dB
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For typical Wi-Fi how mush signal is lost per exterior wall?
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10dB
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Which is better WEP or WPA?
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WPA
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What conflicts happen with 802.11b Networks?
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Microwave ovens and cordless telephones.
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What is the purpose of SSID?
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To give the access point a name.
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How big can an SSID be?
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32 Characters
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What Wi-Fi channels exist in the USA?
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1-11.
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