Chapter 12 - Supplement - Sheet 1

Question 1

3 unlicensed bands by the FCC

Answer 1

900Mhz, 2.4Ghz, 5Ghz

Question 2

ISM Bands

Answer 2

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

Question 3

UNII Bands

Answer 3

Unlicensed National Information Infrastructure. 5GHz

Question 4

Number of channels FCC released for the 2.4GHz band

Answer 4

14

Question 5

Number of configurable channels in the 2.4GHz band

Answer 5

11

Question 6

Non overlapping channels in the 2.4GHz band

Answer 6

1,6,11

Question 7

Max Data speeds for 802.11b

Answer 7

11mbps

Question 8

Data rate shifting

Answer 8

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

Question 9

Frequency and max speed of 802.11g

Answer 9

2.4GHz, 54mbps

Question 10

Frequency and max speed of 802.11a

Answer 10

5Ghz, 54mbps

Question 11

Frequency and max speed of 802.11b

Answer 11

2.4GHz, 11mbps

Question 12

Frequency and max speed of 802.11n

Answer 12

2.4GHz or 5GHz, up to 250mbps

Question 13

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

Answer 13

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

Question 14

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

Answer 14

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

Question 15

DSSS

Answer 15

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

Question 16

OFDM

Answer 16

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

Question 17

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

Answer 17

22MHz wide

Question 18

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

Answer 18

Microwaves, cordless phones, Bluetooth devices

Question 19

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

Answer 19

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

Question 20

DFS

Answer 20

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

Question 21

TPC

Answer 21

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

Question 22

MIMO

Answer 22

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

Question 23

802 standard that introduced DFS, TPC

Answer 23

802.11h

Question 24

Max antennae on an 802.11n device

Answer 24

8

Question 25

Year 802.11 ratified

Answer 25

1997

Question 26

Band for 802.11

Answer 26

2.4GHz

Question 27

Number of channels for 802.11

Answer 27

3

Question 28

Data transmission rates of 802.11

Answer 28

1, 2 Mbps

Question 29

Year 802.11a ratified

Answer 29

1999

Question 30

Band for 802.11a

Answer 30

5Ghz

Question 31

Number of channels for 802.11a

Answer 31

Up to 23

Question 32

Data transmission rates of 802.11a

Answer 32

54mbps

Question 33

Year 802.11b ratified

Answer 33

1999

Question 34

Band for 802.11b

Answer 34

2.4GHz

Question 35

Number of channels for 802.11b

Answer 35

3

Question 36

Data transmission rates of 802.11b

Answer 36

11mbps

Question 37

Year 802.11g ratified

Answer 37

2003

Question 38

Band for 802.11g

Answer 38

2.4Ghz

Question 39

Number of channels for 802.11g

Answer 39

3

Question 40

Data transmission rates of 802.11g

Answer 40

54GHz

Question 41

Year 802.11n ratified

Answer 41

2010

Question 42

Band for 802.11n

Answer 42

2.4GHz or 5GHz

Question 43

Number of channels for 802.11n

Answer 43

Varies

Question 44

Data transmission rates of 802.11n

Answer 44

100+ Mbps

Question 45

2 installation types of all 802.11 WLAN stamdards

Answer 45

Ad hoc and infrastructure

Question 46

Ad hoc wlan network

Answer 46

No access point. PCs connect directly to each other

Question 47

Downsides of ad hoc wlan

Answer 47

Doesn't scale well

Question 48

BSS / BSA

Answer 48

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

Question 49

Distribution system

Answer 49

Connection from the AP to the wired network

Question 50

SSID

Answer 50

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

Question 51

ESS

Answer 51

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.

Question 52

Factors that affect signal strenth

Answer 52

Distance, barriers, protocols used, interference

Question 53

RADIUS

Answer 53

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

Question 54

What is the maximum data rate of IEEE 802.11b?

Answer 54

11Mbps

Question 55

What is the maximum data rate of IEEE 802.11g?

Answer 55

54Mbps

Question 56

What is the maximum data rate of IEEE 802.11a?

Answer 56

54Mbps

Question 57

What is the frequency range of IEEE 802.11b?

Answer 57

2.4GHz

Question 58

What is the frequency range of IEEE 802.11g?

Answer 58

2.4GHz

Question 59

What is the frequency range of IEEE 802.11a?

Answer 59

5GHz

Question 60

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

Answer 60

None

Question 61

Why would we use WPA instead of basic WEP?

Answer 61

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

Question 62

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

Answer 62

IEE 802.11i standard

Question 63

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

Answer 63

Three