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280 networking > Chapters 13 - 14 > Flashcards

Chapters 13 - 14 Flashcards

1
Q

What is 802.11?

A

It is the international standard for wireless networking

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2
Q

What does GHz stand for?

A

gigahertz

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3
Q

What are the two main Wi-Fi frequency ranges?

A

2.4 GHz and 5 GHz

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4
Q

What normal Wi-Fi channels exist (in the USA)?

A

1 - 11

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5
Q

What is Channel 196?

A

It is a channel in the 5 GHz range.

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6
Q

What is a site survey?

A

You check for Wi-Fi signals that already exist.

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7
Q

In networking, what does sniff mean?

A

Sniff means listen to the network trac and try to learn from it.

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8
Q

What channels are commonly usable (in the USA)?

A

1, 6, and 11

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9
Q

Why are many Wi-Fi channels not used?

A

There is too much signal bleed between adjacent channels

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10
Q

What does SSID stand for?

A

service set identier

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11
Q

What is the purpose of the SSID?

A

It gives a name to the wireless access point.

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12
Q

How many characters long can an SSID be?

A

32

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13
Q

Why are some SSIDs hidden?

A

Hiding it provides additional security.

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14
Q

What Wi-Fi security methods are commonly used?

A

none, WEP, WPA, WPA2

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15
Q

What does WEP stand for?

A

wired equivalent privacy

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16
Q

What does WPA stand for?

A

wi-fi protected access

17
Q

Which is better: WEP or WPA?

A

wpa

18
Q

What is the legal maximum Wi-Fi signal in the USA?

A

100 milliwatts (mW)

19
Q

What does dBm stand for?

A

decibels milliwatt (decibels on a milliwatt scale)

20
Q

What is the dierence between dBm and dB?

A

dB is a relative measure. dBm is an absolute measure.

21
Q

What does SNR stand for?

A

signal noise ratio (signal to noise ratio)

22
Q

In what units is SNR measured?

A

decibels (dB)

23
Q

How much SNR do you need for a usable connection?

A

20 dB

24
Q

What is the typical range (in meters) for Wi-Fi signals?

A

100

25
Q

For typical Wi-Fi, how much signal (in dB) can be used up before the
SNR is too low for useful communication?

A

50

26
Q

For typical Wi-Fi, how much signal (in dB) is lost per meter of open air?

A

0.5

27
Q

For typical Wi-Fi, how much signal (in dB) is lost per interior wall
(plaster-board, wooden studs)?

A

5

28
Q

For typical Wi-Fi, how much signal (in dB) is lost per exterior wall (wood,
brick, cement block, metal studs)?

A

10

29
Q

For typical Wi-Fi, how much signal (in dB) is lost per
oor (thick ply-
wood, support beams)?

A

15

30
Q

What typical indoor obstacles aect Wi-Fi signal strength?

A

Open air, interior walls, exterior walls,
oors, furniture, cupboards, ap-
pliances, people.

31
Q

What typical outdoor obstacles aect Wi-Fi signal strength?

A

Open air, people, trees, rain.

32
Q

What con

icts happen with 802.11b networks?

A

microwave ovens and cordless telephones

280 networking (6 decks)

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