Brainscape's Knowledge GenomeTM

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


See full index

CWNA > Chapter 6 > Flashcards

Chapter 6 Flashcards

1
Q

FHSS systems use how many 1MHz channels within the 2.4 GHz ISM Band?

A

79

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

If an HR-DSSS device is used, what is the maximum Data Rate?

A

11 Mbps

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

Used for 802.11 legacy and Bluetooth, this communication technology hops through 75 to 79 1MHz wide channels within the 2.4 GHz ISM band to increase resiliency.

A

FHSS

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

How many channels in the 2.4 GHz ISM band are allowed for use by the FCC in the U.S.?

A

11

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

802.11n uses which communication technology?

A

HT-OFDM

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

How many subcarriers are used in each OFDM channel including data and pilot channels?

A

52

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

Used for 802.11b, this communication technology uses Complementary Code Keying (CCK) to improve data rates and uses 8-bit “chips” to represent up to 8-bits of data.

A

HR-DSSS

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

HR-DSSS runs in which frequency band?

A

2.4 GHz ISM

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

Which technologies are used in the 2.4GHz ISM band? (Choose all that apply)

A

ERP-OFDM
FHSS
HR-DSSS
DSSS

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

What is the maximum number of access points (radios) that can be colocated in the same physical area without channel overlap in the 2.4GHz ISM band?

A

3

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

What is the average amount of aggregate throughput percentage at any data rate in a typical 802.11 system?

A

50%

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

How much bandwidth is available on a single 802.11g channel?

A

20 MHz

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

Used for 802.11a, this communication technology transmits on 52 subcarriers and uses error checking and correcting known as convolutional coding for resiliency.

A

OFDM

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

If data is corrupted by previous data from a reflected signal, this is known as what?

A

Inter-Symbol Interference

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

Which current technology uses FHSS?

A

Bluetooth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Select the three non-overlaping 2.4GHz channels available in the United States

A

1
6
11

17
Q

Which modulation technique is used by OFDM systems communicating at 54 Mbps?

A

64-QAM

18
Q

What is the estimated throughput of a system using ERP-OFDM and 64-QAM at max speed?

A

20 to 29 Mbps

19
Q

How many channels are specified for use with HR-DSSS by the IEEE?

A

14

20
Q

ERP-OFDM runs in which frequency Band?

A

2.4 GHz ISM

21
Q

Used for 802.11 legacy, this communication technology adds redundant data to the transmission and uses 11-bit “chips” to represent 1-bit of data.

A

DSSS

22
Q

What best describes hop time?

A

The period of time that the transmitter takes to hop to the next frequency

23
Q

Which of the following systems has the best balance of throughput and resilience?

A

OFDM

24
Q

What is the Data Rate of a system using ERP-OFDM and 64-QAM at max speed?

A

54 Mbps

25
Q

OFDM runs in which frequency band?

A

5 GHz UNII

26
Q

Which modulation technique is used by HR-DSSS systems communicating at 11 Mbps?

A

DQPSK

CWNA (10 decks)

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