1.6 Given a scenario, implement the appropriate wireless technologies and configurations.

Question 1

802.11a

Answer 1

• One of the original 802.11 wireless standards
• Operates in the 5 GHz range
• Higher frequency is absorbed by objects in the way

Question 2

802.11b

Answer 2

• Operates in the 2.4 GHz range
• 11 megabits per second (Mbit/s)
• Better range than 802.11a - Less absorption problems
• More frequency conflict-• Baby monitors, cordless phones,

Question 3

802.11g

Answer 3

• Operates in the 2.4 GHz range
• 54 megabits per second (Mbit/s)
• Same as 802.11a (but a little bit less throughput)
• Backwards-compatible with 802.11b

Question 4

802.11n

Answer 4

• Operates at 5 GHz and/or 2.4 GHz
• 802.11n uses MIMO

• 600 megabits per second (Mbit/s)

Question 5

802.11ac

Answer 5

• Operates in the 5 GHz band
• Less crowded, more frequencies
• Increased channel bonding - Larger bandwidth usage
• Eight MU-MIMO streams

Question 6

Cellular Network Standards

Answer 6

• Separate land into “cells”
• 2G networks
• CDMA - Code Division Multiple Access

Question 7

GSM

Answer 7

• GSM - Global System for Mobile Communications
90% of market
At&t TMobile • Move your SIM card (Subscriber Identity Module) from

Question 8

Time-Division Multiple Access (TDMA)

Answer 8

• Multiple streams are combined into a single stream, and then broken out again - “Muxing”

Question 9

CDMA

Answer 9

• Code Division Multiple Access
• Everyone communicates at the same time - Each call uses a different code - The codes are used to filter each call on the

• Everyone communicates at the same time

Question 10

4G and LTE

Answer 10

• Long Term Evolution (LTE) - A “4G” technology
• Converged standard (GSM and CDMA providers)
• Based on GSM and

Question 11

Wireless Network Technologies

• Frequency

Answer 11

• 2.4 GHz or 5 GHz
Channels - Groups of frequencies, numbered by the IEEE - Non-overlapping channels would be necessary
Bandwidth• 20 MHz, 40 MHz, 80 MHz, 160 MHz

Question 12

802.11 channel bandwidths

Answer 12

• 802.11a - 20 MHz
• 802.11b - 22 MHz
• 802.11g - 20 MHz
• 802.11n - 20 MHz or 40 MHz

Question 13

• 802.11ac

Answer 13

• 40 MHz for 802.11n stations
• 80 MHz required for 802.11ac stations
• 160 MHz optional (contiguous channels

Question 14

2.4 GHz Spectrum for 802.11 - North America

Answer 14

1,6,11 channels

Question 15

5 GHz Spectrum for 802.11 - North America

Answer 15

IEEE Channel # 36 40 44 48 52 56 60 64 68 72 76 80 84 88 92 96 100 104 108 112 116 120 124 128 132 136 140 144 149 153 157 161 165 169 173 177

Question 16

Power level controls

Answer 16

• Usually a wireless configuration
• Maintain speeds across required distances

• Location, location, location

Question 17

Omnidirectional antennas

Answer 17

• One of the most common
• Good choice for most environments
• You need coverage in all directions
• No ability to focus the signal

Question 18

Directional antennas

Answer 18

• Focus the signal
• Focus the signal
• Antenna performance is measured in dB
• Yagi antenna -very directional and high gain
• Parabolic antenna - focus to the signal to a single point

Question 19

Wireless survey tools

Answer 19

• Signal coverage
• Potential interference
• Built-in tools
• Spectrum analyzer