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CWAP® Certified Wireless Analysis Professional: Official Study Guide

by David A. Westcott, David D. Coleman, Peter Mackenzie, Ben Miller

March 2011

Intermediate to advanced

700 pages

18h 13m

English

Sybex

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Cover
Title Page
Copyright
Dear Reader
Dedication
Acknowledgments
About the Authors
Foreword
Introduction
Assessment TestAnswers to Assessment Test
Chapter 1: 802.11 Overview
OSI ModelPackets, Frames, and BitsData-Link LayerPhysical Layer802.11 Services802.11 FramesIEEE 802.11-2007 Standard and AmendmentsWi-Fi AllianceSummaryExam EssentialsKey TermsReview QuestionsAnswers to Review Questions

Chapter 2: 802.11 Physical (PHY) Layer Frame Format
Physical Layer OperationsPhysical LayerPLCP Protocol Data Unit2.4 GHz Communications5 GHz CommunicationsAdjacent, Nonadjacent, and Overlapping ChannelsClause 14 FHSS PHYClause 15 DSSS PHYClause 17 OFDM PHYClause 18 HR-DSSS PHYClause 19 ERP PHYClause 20 HT PHYSummaryExam EssentialsKey TermsReview QuestionsAnswers to Review Questions
Chapter 3: 802.11 MAC Sublayer Frame Format
General 802.11 MPDU FormatMAC HeaderFrame Control FieldDuration/ID FieldMAC Layer AddressingSequence Control FieldQoS Control FieldFrame BodyFCS FieldSummaryExam EssentialsKey TermsReview QuestionsAnswers to Review Questions
Chapter 4: 802.11 Management Frames
Management Frame TypesInformation Elements and FieldsAction FramesSummaryExam EssentialsKey TermsReview QuestionsAnswers to Review Questions
Chapter 5: 802.11 Control Frames
Understanding Control FramesCarrier SenseRTS/CTS FramesCTS-to-SelfProtection MechanismAcknowledgement FrameBlock Acknowledgement RequestBlock AcknowledgementPS-PollControl WrapperContention FreeSummaryExam EssentialsKey TermsReview QuestionsAnswers to Review Questions
Chapter 6: Data Frames
Data SubtypesData Frame Address FieldsFragmentationData Frame AggregationRate SelectionSummaryExam EssentialsKey TermsReview QuestionsAnswers to Review Questions
Chapter 7: 802.11 Medium Contention
CSMA/CAInterframe SpacesRandom BackoffFrame TransmissionQuality of Service802.11nExam EssentialsKey TermsSummaryReview QuestionsAnswers to Review Questions
Chapter 8: Power Management
Wireless Radios and Battery LifePower Management Structure802.11 Power Management802.11e Unscheduled Automatic Power Save Delivery802.11n Power ManagementIBSS Power ManagementExam EssentialsKey TermsReview QuestionsAnswers to Review Questions
Chapter 9: 802.11 Security
AuthenticationWLAN Encryption MethodsWPA/WPA2Robust Security Network (RSN)802.1XEAP4-Way HandshakeGroup Key HandshakeFast BSS Transition (FT)802.11w Protected Management FramesSummaryExam EssentialsKey TermsReview QuestionsAnswers to Review Questions
Chapter 10: 802.11n HT Analysis
Introduction to 802.11nHT Control FieldHT Action Frames and Information ElementsHT Capabilities ElementHT Operation ElementSummaryExam EssentialsKey TermsReview QuestionsAnswers to Review Questions
Chapter 11: Spectrum Analysis
Spectrum Analyzer OptionsReview of RF FundamentalsHow Network Interface Cards (NICs) WorkHow Spectrum Analysis WorksDisplaying Spectrum Analysis DataLocating and Identifying RF Interfering DevicesRF Signature CharacteristicsExample RF SignaturesSummaryExam EssentialsKey TermsReview QuestionsAnswers to Review Questions
Chapter 12: Protocol Analyzer Operation and Troubleshooting
Understanding Protocol AnalyzersProtocol Analyzer FeaturesProtocol Analysis OperationSummaryExam EssentialsKey TermsReview QuestionsAnswers to Review Questions
Appendix: About the Companion CD
What You’ll Find on the CDSystem RequirementsUsing the CDTroubleshooting
Glossary
Index

Content preview from CWAP® Certified Wireless Analysis Professional: Official Study Guide

Chapter 7

802.11 Medium Contention

In this chapter, you will learn about the following:

802.11 Channel Access
- Describe the operation of CSMA/CA
- Describe the essential components of the DCF
- Describe the steps taken before a frame transmission

That 802.11 devices are resilient is no secret. Anyone who has ever managed a WLAN in a crowded space such as a trade show or office complex can attest to that. The secret is how it all works. The IEEE 802.11 standard was blessed with an elegant mosaic of medium contention protocols that allow a large number of devices to effectively share a wireless channel. Medium contention means that all 802.11 devices—access points (APs) and base stations—with frames ready to be transmitted onto a given channel ...

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CWAP® Certified Wireless Analysis Professional: Official Study Guide

by David A. Westcott, David D. Coleman, Peter Mackenzie, Ben Miller

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.