1.6

Question 1

802.11a

Answer 1

One of the original standards in 1999
5GHz range
54 Mbit/s
Smaller range than 802.11b, high frequency is absorbed

Question 2

802.11b

Answer 2

One of the original standards in 1999
2.4GHz range
11 Mbit/s
better range than .11a, lower frequency bounces off instead of getting absorbed
baby monitors, cordless phones, microwave, bluetooth interferes

Question 3

802.11g

Answer 3

Introduced June 2003
2.4 GHz
54 Mbit/s
Backwards compatible with 802.11b, same frequency conflict

Question 4

802.11n

Answer 4

October 2009
5 GHz and 2.5 GHz / 40 MHz channel widths
150 Mbit/s / 40MHz mode with 4 antennas
4 MIMO (Multiple-input multiple-output)

Question 5

802.11ac

Answer 5

January 2014
5 GHz / 160 MHz channel bandwidth
Increased channel bonding
denser signaling modulation
866.7 Mbit/s
8 MIMO

Question 6

GSM

Answer 6

Global System for Mobile Communications
90% of Market, used SIM cards
Used TDMA to multiplex calls, share time

Question 7

CDMA

Answer 7

Code Division Multiple Access
Everyone communicates at the same time
Each call uses a different code, used to filter calls on the receiving side

Question 8

TDMA

Answer 8

Time-Division Multiple Access

multiple streams are combined into a single stream and then broken out again “Muxing”

Question 9

4G / LTE

Answer 9

Long Term Evolution
Converged standard between providers
Based on GSM and EDGE (Enhanced Data rates for GSM Evolution)
D/L 150 Mbit/s
LTE-A 300 Mbit/s

Question 10

Frequency

Answer 10

2.4 GHz/5 GHz

Channels

Question 11

Channel Bandwidths

Answer 11

802. 11a - 20 MHz
803. 11b - 22 MHz
804. 11g - 20 MHz
805. 11n - 20 MHz or 40 (two bonded)
806. 11ac - 40 MHz, 80 MHz (required for ac)

Question 12

Channel Bandwidths

Breakdown/Chart

Answer 12

2.4 - #1/6/11, 20 MHz bands

5 - #36-177, can combine for 40/80/160 MHz

Question 13

MIMO .11n

MU-MIMO .11ac

Answer 13

Multi-User Multiple-Input and Multiple-Output
(antennas on AP) x (antennas on client) : # streams
2x2:2, 3x3:2
.11n one device stream at a time
.11ac multiple devices stream

Question 14

Power level

Omnidirectional vs Unidirectional

Answer 14

Set AP power as low as you can, might require site surveys
Omni-signal evenly distributed
Uni-signal focused one direction
Performance measured in dB (double power every 3dB)
Yagi, Parabolic

Question 15

Wireless Survey

Answer 15

Shows signal coverage, potential interference

Spectrum Analyzer - shows details about what is happening at every frequency