ch 6

1.

1 point

Frequency-hopping spread spectrum (FHSS) operates at what speeds? (Choose 2)

11

2

5.5

1

2.

1 point

Under the 802.11n Standard one way throughput is increased is by aggregation of channels?

True

False

3.

1 point

Which of the following is a real FCC regulation?

UNII-1 band power up to, but not exceed 250 mW

UNII-2 can have max power output of up to 25 mW

UNII-3 max power output is 1 W

The max EIRP for the UNII-2 extended band is 56 dBi

4.

1 point

The 802.11a protocol has how many non-overlapping channels per band?

3

4

6

8

5.

1 point

IEEE 802.11n uses 20 MHz and 40 MHz channels to increase the throughput.

True

False

6.

1 point

Which of the following is not a function that enhances MIMO performance?

Transmit Beam-forming

Diversity Coding

Spatial multiplexing

Convolution Coding

7.

1 point

How many channels does Japan support under the 802.11b standard?

12

13

11

14

8.

1 point

For wireless data rates at 1Mbps, what is the modulation technique that is used?

DBPSK/Barker 11

DRS

CCK

DQPSK/Barker 11

9.

1 point

What RF Technology does the original IEEE 802.11 protocol use? (Choose 2)

DSSS

FHSS

DHSS

FSSS

10.

1 point

What 802.11 protocol is backward compatible and also what technology allows this? (Choose 2)

A

DSSS Encoding

N

D

OFDM Encoding

11.

1 point

What RF technology or technologies does 802.11b use?

FHSS

DSSS

OFDM

Cheesewheel

12.

1 point

What two RF Technologies does the 802.11G protocol use? (Choose 2)

MIMO

ERP

DSSS

OFDM

13.

1 point

Which band operates at a frequency of 5.25-5.35 GHz, also known as UNII Low?

UNII-2

UNII-3

UNII-4

UNII-1

14.

1 point

What is the average throughput for 802.11g clients connecting to an 802.11g access point?

6

22

54

48

15.

1 point

Which protocols use OFDM? (3)

G

N

A

B

16.

1 point

If a transmitter can emit over three antennas, it has three data streams. If it can receive over three antennas, it has three receive chains. What is this called?

2X3

3X2

3X3

2X2

17.

1 point

Pick characteristics that 802.11A and 802.11N have in common. (Choose 2)

Neither use OFDM

Both use OFDM

Both use MIMO

Both use the UNII bands

18.

1 point

What function of MIMO mitigates the effects of multipath distortion?

OFDM

Maximal ratio combining

Convolution Coding

Spatial multiplexing

19.

1 point

What happened when a client using the 802.11b enters an 802.11g network?

A protection mechanism is invoked

Network Crash

Nothing happens, it keeps functioning as normal

The b client uses g standards

20.

1 point

Pick the following functions of a MIMO antenna technology that enhance performance. (Choose 2)

Frequency frame multiplexing

Spatial multiplexing

Transmit beam-forming

Non-linear spatial encoding

21.

1 point

Which protocol only uses OFDM?

G

N

A

B

22.

1 point

When was the 802.11g standard ratified?

2001

2002

2003

2000

23.

1 point

802.11b offers higher data rates up to?

11

5.5

22

2

24.

1 point

OFDM is used in the 802.11a protocol?

True

False

25.

1 point

Which wireless standards are backward compatible with each other? (Choose 2)

G/B

A/N

A/B

N/G

26.

1 point

What kind of modulation does the 802.11b protocol use? (Choose 2)

CCK

DBPSK

Barker 11

DQPSK

27.

1 point

What protocol has the fastest operating speed?

B

A

G

N

28.

1 point

Which protocol has a maximum data rate of 54 Mbps in the 2.4 GHz range?

G

A

N

B

29.

1 point

802.11g is compatible with 802.11a.

True

False

30.

1 point

The 802.11n protocol can achieve theoretical speeds up to 300 Mbps?

True

False

31.

1 point

What is the EIRP maximum output power not to exceed under FFC regulations for the UNII-2 band?

250mW

1W

10W

50mW

32.

1 point

What does the 802.11g protocol use for encoding? (Choose 2)

Barker 12

Barker 11

CCK

CBK

33.

1 point

What does beam-forming do?

Takes a signal, splits it into a bunch of lower-rate streams, and then sends each one out different antennas.

Defines a number of channels in a frequency range.

A technique using multiple transmit antennae to send copies of a signal.

Uses a series of codes called complementary sequences.

34.

1 point

What is used to allocate how frames are sent when using 802.11n?

CTS

RTS/CTS

RCTS

RTS

35.

1 point

DSSS only operates at 1 Mbps and 2 Mbps.

True

False

36.

1 point

802.11a operates at what frequency

2.4

11

7

5

37.

1 point

What type of coding does 802.11a support

Barker 11

CCK

Convolution

DBPSK

38.

1 point

If the condition is Non-ERP Present=Yes, what additional 2 conditions are present? (Choose 2)

802.11A and 802.11G clients are communicating with an 11N Access Point

802.11B and 802.11G clients are communicating with an 11G Access Point

Use protection = Yes, but only if 11A clients are present

Use protection = No

Use protection = Yes