Chapter 5

Question 1

What are 3 original Physical layer specifications?

Answer 1

IR
FHSS
DSSS

Question 2

What is IR?

Answer 2

Infrared

Uses light-based medium

Question 3

What is FHSS?

Answer 3

Frequency Hopping Spread Spectrum

When the bandwidth is wider than what is required to carry the data.

Question 4

What is DSSS?

Answer 4

Direct Sequence Spread Spectrum

Easiest to implement

Question 5

What were the originaI IEEE 802.11 Features?

Answer 5

Radios used license-free 2.4Ghz ISM band

Data rates of 1 and 2Mbps

Question 6

802.11b - 1999

Answer 6

By IEEE
HR-DSSS
5.5 and 11Mbps
2.4Ghz to 2.48

Question 7

802.11a - 1999

Answer 7

IEEE
5 Ghz
100 mhz wide

Question 8

802.11g - 2003

Answer 8

IEEE
up to 54mbps
2.4 Ghz

Question 9

802.11h - 2003

Answer 9

IEEE
Introduced DFS
Introduced TPC

Question 10

What is DFS?

Answer 10

Dynamic Frequency Selection

Essentially radar-detection and radar-interference avoidance

Question 11

What is TPC?

Answer 11

Transmit Power Control

Used to regulare the power levels used by OFDM radios in the 5Ghz frequency bands

Question 12

802.11i - 2004

Answer 12

IEEE
WEP was introduced with 802.11 
OS authentication
Shared key authentication
WEP was cracked around 2001
WPA was introduced 2002

Question 13

802.11e - 2005

Answer 13

IEEE
HCF
WMM

Question 14

What is HCF?

Answer 14

Hybrid Coordination Function

Question 15

What is WMM?

Answer 15

Wi-Fi Multimedia

Question 16

802.11r - 2008

Answer 16

Known as Fast BSS Transition

Question 17

802.11k - 2008

Answer 17

Provides a means of RRM