1.6

Question 1

What are 802.11a specifications:

Answer 1

1. 5GHz
2. 54 megabits/s
3. smaller range than 802.11b

Question 2

What are 802.11b specifications:

Answer 2

1. 2.4 GHz
2. 11 megabits/s
3. better range than 802.11a
4. more frequency conflict

Question 3

What are 802.11g specifications:

Answer 3

1. 2.4 GHz
2. 54 megabits/s
3. backwards-compatible with 802.11b
4. Same frequency conflict problem as 802.11b

Question 4

What are 802.11n specifications:

Answer 4

1. 5GHz and/or 2.4 GHz
2. 600 megabits/s
3. uses MIMO (multiple-input multiple-output, multiple transmit and receive antennas)

Question 5

What are 802.11ac specifications:

Answer 5

1. 5 GHz
2. Increased channel bonding
3. denser signaling modulation
4. Eight MU_MIMO streams (twice as 802.11n)

Question 6

What are the 2G Networks types?

Answer 6

1. GSM

2. CDMA

Question 7

What does GSM stand for?

Answer 7

Global System for Mobile Communications

Question 8

WHat does CDMA stand for?

Answer 8

Code Division Multiple Access

Question 9

What is TDMA?

Answer 9

The original GSM used TDMA to multiplex calls.

Question 10

What is a SIM card?

Answer 10

Subscriber Identity Module

Question 11

What does LTE stand for?

Answer 11

Long Term Evolution ( a 4G technology) with a download rate of 150 Mbit/s

Question 12

What is LTE-A?

Answer 12

LTE Advanced which supports download rate of 300 Mbit/s

Question 13

What frequencies do 802.11 technologies use?

Answer 13

some use 2.4 GHz, some use 5 GHz and some use both.

Question 14

What are channels?

Answer 14

Groups of frequencies, numbered by the IEEE, but non-overlapping channels would be necessary.

Question 15

What is bandwidth?

Answer 15

Amount of frequency in use (like 20, 40, 80 or 160 MHz)

Question 16

What does MU-MIMO stand for?

Answer 16

Multi User MINO

Question 17

What does the MIMO depend on?

Answer 17

Number of antennas

Question 18

How can you read the number of antennas?

Answer 18

(Antennas on the access point)x(antennas on the client):number of streams
2x2:2, 3x3:2, 4x4:4

Question 19

What is Omnidirectional antennas?

Answer 19

Omni = all. One of the most common which distributes signal evenly on all sides.

Question 20

What is advantage and disadvantage of Omnidirectional antennas?

Answer 20

Av: Good choice for most environments because it send signals in all directions.
Disadv: No ability to focus the signal and a different antenna will be required.

Question 21

What is a directional antenna?

Answer 21

It’s an antenna which focuses the signal (sends and receives signal in a single direction) and is measured in dB

Question 22

What are some examples of directional antennas?

Answer 22

1. Yagi (Very directional and high gain)

2. Parabolic (Focus the signal to a single point)

Question 23

What is a site survey?

Answer 23

A site survey is performed first by examining the blueprints or floor plan of the premises to understand the layout and to identify features that might produce radio frequency interference (RFI).

Question 24

What is channel bonding?

Answer 24

802.11n can obtain more bandwidth with the option to use two adjacent 20 MHz channels as a single 40 MHz channel, referred to as channel bonding.