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CompTIA Network+ > Chapter 12 - Supplement - Sheet 1 > Flashcards

Chapter 12 - Supplement - Sheet 1 Flashcards

1
Q

3 unlicensed bands by the FCC

A

900Mhz, 2.4Ghz, 5Ghz

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2
Q

ISM Bands

A

Industrial, scientific, and medial. 900Mhz, 2.4Ghz

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3
Q

UNII Bands

A

Unlicensed National Information Infrastructure. 5GHz

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4
Q

Number of channels FCC released for the 2.4GHz band

A

14

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5
Q

Number of configurable channels in the 2.4GHz band

A

11

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6
Q

Non overlapping channels in the 2.4GHz band

A

1,6,11

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7
Q

Max Data speeds for 802.11b

A

11mbps

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8
Q

Data rate shifting

A

Ability to reduce transmission speeds without restarting a connection to accommodate for various distances from an AP. EXAMPLE: 1mbps when farthest. 11mbps when a little closer. All 802.11 WLAN technologies have this

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9
Q

Frequency and max speed of 802.11g

A

2.4GHz, 54mbps

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10
Q

Frequency and max speed of 802.11a

A

5Ghz, 54mbps

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11
Q

Frequency and max speed of 802.11b

A

2.4GHz, 11mbps

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12
Q

Frequency and max speed of 802.11n

A

2.4GHz or 5GHz, up to 250mbps

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13
Q

Although 802.11g devices operate on the same frequency as 802.11b devices, 801.11b devices can’t be software upgraded to 802.11g because

A

802.11g uses a different chipset to attain the 54mbps speeds at 2.4GHz

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14
Q

Although you can use 802.11b equipment in an 802.11g environment, what happens?

A

All clients must use the 802.12b modulation technique, DSSS. This is not as efficient and results in speeds

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15
Q

DSSS

A

Direct sequence spread spectrum. Modulation technique used by 802.11b devices.

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16
Q

OFDM

A

Orthogonal frequency division multiplexing. Modulation technique used by 802.11g devices

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17
Q

How wide are each of the 14 channels in the 2.4Ghz range?

A

22MHz wide

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18
Q

Common devices that operate on (and interfere with) the 2.4Ghz bamd

A

Microwaves, cordless phones, Bluetooth devices

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19
Q

Number of channels available to 802.11a devices, which operate on the 5Ghz band

A

12 non-overlapping channels at first. 11 more added in 2004

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20
Q

DFS

A

Dynamic frequency selection. Feature of 802.11a that detects radar signals operating at the 5GHz band and marks that specific channel as unavailable to clients

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21
Q

TPC

A

Transmit power control. Feature of 802.11a devices that allows for changing the power of transmission. Example: reducing to 5mW reduces transmission radius and improves performance for clients in I,mediate area

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22
Q

MIMO

A

Multiple input, multiple output. Feature of 802.11n that allows for multiple trams,otters and recovers to increase data throughout.

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23
Q

802 standard that introduced DFS, TPC

A

802.11h

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24
Q

Max antennae on an 802.11n device

A

8

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25
Q

Year 802.11 ratified

A

1997

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26
Q

Band for 802.11

A

2.4GHz

27
Q

Number of channels for 802.11

A

3

28
Q

Data transmission rates of 802.11

A

1, 2 Mbps

29
Q

Year 802.11a ratified

A

1999

30
Q

Band for 802.11a

A

5Ghz

31
Q

Number of channels for 802.11a

A

Up to 23

32
Q

Data transmission rates of 802.11a

A

54mbps

33
Q

Year 802.11b ratified

A

1999

34
Q

Band for 802.11b

A

2.4GHz

35
Q

Number of channels for 802.11b

A

3

36
Q

Data transmission rates of 802.11b

A

11mbps

37
Q

Year 802.11g ratified

A

2003

38
Q

Band for 802.11g

A

2.4Ghz

39
Q

Number of channels for 802.11g

A

3

40
Q

Data transmission rates of 802.11g

A

54GHz

41
Q

Year 802.11n ratified

A

2010

42
Q

Band for 802.11n

A

2.4GHz or 5GHz

43
Q

Number of channels for 802.11n

A

Varies

44
Q

Data transmission rates of 802.11n

A

100+ Mbps

45
Q

2 installation types of all 802.11 WLAN stamdards

A

Ad hoc and infrastructure

46
Q

Ad hoc wlan network

A

No access point. PCs connect directly to each other

47
Q

Downsides of ad hoc wlan

A

Doesn’t scale well

48
Q

BSS / BSA

A

Basic service set or basic service area. Describes the services provided to clients connected to an Ap in infrastructure mode, in a defined area

49
Q

Distribution system

A

Connection from the AP to the wired network

50
Q

SSID

A

Security Set Identifier. 32 character Id that refers to a wireless network and defines its BSS

51
Q

ESS

A

Extended service set. When two or more APs use the same SSID on different channels, with overlapping BSA of 10% or more. This allows clients to roam in the same network from one AP to another.

52
Q

Factors that affect signal strenth

A

Distance, barriers, protocols used, interference

53
Q

RADIUS

A

Security protocol that manages authorization, central access, accounting supervision. Users connect to the network by being authenticated by the radius server

54
Q

What is the maximum data rate of IEEE 802.11b?

A

11Mbps

55
Q

What is the maximum data rate of IEEE 802.11g?

A

54Mbps

56
Q

What is the maximum data rate of IEEE 802.11a?

A

54Mbps

57
Q

What is the frequency range of IEEE 802.11b?

A

2.4GHz

58
Q

What is the frequency range of IEEE 802.11g?

A

2.4GHz

59
Q

What is the frequency range of IEEE 802.11a?

A

5GHz

60
Q

APs come set up with what type of security enabled by default?

A

None

61
Q

Why would we use WPA instead of basic WEP?

A

Values of WPA keys can change dynamically while the system is being used. Also WEP sucks.

62
Q

Which IEEE committee has been sanctioned by WPA and is called WPA2?

A

IEE 802.11i standard

63
Q

The IEEE 802.11b/g basic standard has how many non-overlapping channels?

A

Three

CompTIA Network+ (30 decks)

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