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Wireless Test 2 > Chapter 5 > Flashcards

Chapter 5 Flashcards

1
Q

Original IEEE 802.11 Features?

A

Physical Layer
MAC Sublayer of the Data-Link layer
Data rates of 1 and 2 Mbps

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2
Q

Defined three Physical layer specifications?

A

Infrared (IR)
Frequency Hopping Spread Spectrum (FHSS)
Direct Sequence Spread Spectrum (DSSS)

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3
Q

IEEE 802.11b

A 
Was released in 1999
Backwards compatible
Defined High-Rate DSSS (HR-DSSS)
HR-DSSS added 5.5 and 11Mbps
2.4 Ghz to 2.4835
Uses CCK
Uses Barker Code
Defined PBCC
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4
Q

What is CCK?

A

Spreading/Coding technique called Complementary Code Keying

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5
Q

What is PBCC?

A

Packet Binary Convolutional Code

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6
Q

IEEE 802.11a

A 
1999
Not backwards compatible
Defined OFDM
Eight data rates, 6, 9, 12, 18, 24, 36, 48, 54
Operated in less crowded 5Ghz bands
Total of 12 channels, 4 in each band
Each band is 100 Mhz wide
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7
Q

What is OFDM?

A

Orthogonal Frequency Division Multiplexing

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8
Q

802.11g

A 
2003
Backwards compatible with 11 DSSS and 11b HR-DSSS
Defined ERP
ERP had 8 data rates
2.4Ghz to 2.4835Ghz
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9
Q

What is ERP?

A

Extended Rate Physical

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10
Q

802.11h

A 
2003
Defined:
- Dynamic Frequency Selection
- Transmit Power Control
Introduced new UNII-2 Extended band
11 additional channels
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11
Q

What is DFS?

A

Dynamic Frequency Selection
Required for radio cards in the UNII-2 and UNII-2 Extended bands
Radar-detection and Radar-interference avoidance technology
Used to satisfy regulatory requirements

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12
Q

What is TPC?

A

Transmit Power Control
Used to regulate the power levels used by OFDM radios in the 5Ghz frequency bands
-
DFS and TPC information is exchanged between clients and APs inside management frames

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13
Q

802.11i

A 
2004
WEP was introduced in 1997
Open System authentication
Shared Key authentication (security risks)
WEP was cracked around 2001
Defined stronger encryption
Robus Security Network (RSN)
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14
Q

802.11e

A

2005
Defines Layer 2 MAC methods need to meet QoS requirements
HCF was introduced
Wi-Fi Alliance QoS certification was known as WMM

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15
Q

What is HCF?

A

Hybrid Coordination Function
Two access methods to provide QoS
- Enhanced Distributed Channel Access (EDCA)
- Hybrid Coordination Function Controlled Channel Access (HCCA)

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16
Q

What is WMM?

A

Wi-Fi Multimedia

17
Q

802.11r

A 
2008
Known as Fast BSS Transition
Known as Secure Roaming
Defines Robust Secure Network
Proposed due to time restraints of roaming for applications
18
Q

802.k

A

2008
Provides a means of Radio Resource Measurement (RRM)
Defines a mechanism in which client station resource data is gathered and processed by an AP or controller
Client can also request information
Transmit Power Control

19
Q

TPC contents?

A

Client Statistics
Channel Statistics
Neighbor Reports

20
Q

802.11w

A

2009
Designed to deliver management frames in a secure manner
To prevent DoS attacks

21
Q

802.11n

A 
2009
Designed to increase throughput in both the 2.4 Ghz and 5Ghz bands
Defined High Throughput (HT)
Data rates up to 600Mbps
Uses MIMO technology
22
Q

802.11v

A

2011
Provides the ability to configure client stations wireless from a central management point
Defines Wireless Network Management

23
Q

802.11s

A

2011
Designed to standardize mesh networking
Uses mesh routing protocol call Hybrid Wireless Mesh Protocol

24
Q

Mesh devices include?

A

Mesh Point
Mesh Access Point
Mesh Point Portal

25
Q

802.11ac

A 
Goal of throughput above 1Gbps
Will define Very High Throughput
Uses 5Ghz bands
Wider channels - 80Mhz and 160Mhz
New modulation 256-QAM
Improved MIMO and beamforming
26
Q

802.11ad

A 
2012
Defines VHT enchancements
Using higher frequency 60GHz band
Potentially up to 7Gbps
Less range
Requires new encryption mechanisms
27
Q

802.11af

A

Allows the use of Wi-Fi in the TV whitespace frequencies between 54Mhz and 790Mhz
Lower frequencies would require lower data rates
For long-distance outdoor transmissions

28
Q

802.ah

A

Defining the use of Wi-Fi frequencies below 1Ghz
Would have greater range
Can enhance IoT or M2M communication

Wireless Test 2 (5 decks)

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