Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

IT280 Reviewer > E4 Wifi > Flashcards

E4 Wifi Flashcards

1
Q

What is 802.11?

A

It is the international standard for wireless networking

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What does GHz stand for?

A

gigahertz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the two main Wi-Fi frequency ranges?

A

2.4 GHz and 5 Ghz

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

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

A

1 -11

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is Channel 196?

A

It the channel in the 5 GHz range

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is a site survey?

A

You can check for WiFi signals that already exist.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

In networking, what does sniff mean?

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What channels are commonly usable (in the USA)?

A

1, 6, 11

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Why are many Wi-Fi channels not used?

A

There is too much signal bleed between adjacent channels

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does SSID stand for?

A

service set identifier

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the purpose of the SSID?

A

It gives a name to the wireless access point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

How many characters long can an SSID be?

A

32

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Why are some SSIDs hidden?

A

Hiding it provides additional security

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

List the four Wi-Fi security methods that are commonly used.

A

none, wep, wpa, wpa2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What does WEP stand for?

A

wired equivalent privacy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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 milliwatts) in the USA?

A

100

19
Q

What does dBm stand for?

A

decibels miliwatt (decibels on a miliwatt scale)

20
Q

What is the difference between dBm and dB?

A

dB is a relative measure, dBM is a absolute measure.

21
Q

What does SNR stand for?

A

signal to noise ratio

22
Q

In what units is SNR measured?

A

decibels (dB)

23
Q

How much SNR (in dB) do you need for a usable connection?

A

20

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 ten meters of open air?

A

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 floor (thick plywood, support beams)?

A

15

30
Q

What typical indoor obstacles affect Wi-Fi signal strength?

A

Open air, interior walls, exterior walls, floor, furniture, cupboards, appliances, people.

31
Q

What typical outdoor obstacles affect Wi-Fi signal strength?

A

Open air, people. trees, rain.

32
Q

What conflicts happen with 802.11b networks?

A

microwave ovens and cordless telephones

33
Q
A

IT280 Reviewer (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions