Overview

This advanced course delivers up-to-date, hands-on practical training using the latest enterprise wireless network troubleshooting tools. Attendees work with RF Spectrum Analysis and Protocol Analysis tools, and learn advanced Wi-Fi network Troubleshooting and Diagnosis techniques, to gain an in-depth understanding Wi-Fi networks and their operation. The course helps attendees prepare for the Certified Wireless Analysis Professional (CWAP) industry certification, and to progress towards application for the Internationally-recognised CWNE (Certified Wireless Network Expert) Certification.

Duration

4 days

Audience

  • All staff who need to be able to Support and Troubleshoot Wi-Fi networks with authority.
  • Wi-Fi network professionals preparing for the Certitrek (CWNP) CWAP-403 industry certification exam.
  • Wi-Fi network professionals progressing towards the Internationally-recognised CWNE (Certified Wireless Network Expert) Certification.

Prerequisites

Attendees should have existing knowledge and skills to the level of WCC Certified Wireless Network Manager (CWNM), Certified Wireless Network Administrator (CWNA) or equivalent; and a good understanding of 802.11 Physical and MAC layers before attending this course.

Objectives

Analyse, assess and troubleshoot Enterprise Wi-Fi networks in depth.
Use advanced Wi-Fi network analysis tools from the industry’s leading manufacturers.
Gain confidence and familiarity with Wi-Fi RF spectrum analysers, using plots and charts to display and interpret spectrum data.
Use Wi-Fi network analysis tools to capture and visualise 802.11 frame types, formats and 802.11 protocol exchanges.
Gain hands-on troubleshooting skills by diagnosing common problems in Wi-Fi networks.
Prepare for the Certitrek (CWNP) CWAP-403 Certified Wireless Analysis Professional exam.
Progress towards application for the Internationally-recognised CWNE (Certified Wireless Network Expert) Certification.

Content Headings

Principles of WLAN Communication
802.11 Working Group
OSI reference model and the 802.11 PHY and MAC
Communication sublayers and data units

Advanced Troubleshooting Processes for Wi-Fi Networks
The CWNP CWAP Troubleshooting Methodology
Identify a Problem, its Scale, Causes
Wi-Fi networks analysis tools
Throughput Testing
Operating system commands and utilities

WLAN architecture components
Organisation of station forwarding
Addressing and internetworking operation
Modern WLAN product architectures

Physical (PHY) Layer Formats and Technologies
Physical layer functions
Preamble function and format
Header purpose and structure
Analysis of PHY problems
Physical PPDU formats
– 802.11b
– 802.11a
– 802.11g
– 802.11n
– 802.11ac

MAC Layer Formats and Technologies
MAC frame components
MAC encapsulation
Fields and subfields of the MAC header
Frame Control
Frame types and subtypes and their uses
Addressing
Frame body
Data frame format
Control frame format
Management frame format
Information elements and fields

802.11 Protocol Operation
Beaconing and synchronisation
Scanning
Client state machine
802.11 contention
QoS
Admission control
Band steering and airtime fairness mechanisms
Fragmentation

Advanced 802.11 Protocol Operation
Acknowledgments and Block acknowledgments
Protection mechanisms and backward compatibility
Power management
Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC)
Security components, methods, and exchanges
Roaming procedures exchanges
Future protocol enhancements

802.11n (HT)
Transmit beamforming
Spatial multiplexing
Maximal Ratio Combining (MRC)
Space-Time Block Coding
40 MHz channels
Frame aggregation
HT-OFDM format
Modulation and Coding Schemes (MCS)
HT frame formatting
.. and More

802.11ac (VHT)
Analysing 80MHz and 160MHz channels
Dynamic Bandwidth Operation (DBO)
Standardised Transmit Beamforming (TxBF)
Multi-User MIMO (MU-MIMO)
VHT Transmit Opportunity (TXOP)
Coexistence Mechanisms

802.11ax (HE)
Major problems with Wi-Fi today
OFDM Subcarrier spacing
Orthogonal Frequency-Division Multiple Access (OFDMA)
Long OFDM symbol
Resource Units
Subchannel Allocation for OFDMA
Uplink Multi-User (UL-MU) transmissions
8×8 Multi-user Multiple-Input Multiple-Output (MU-MIMO)
Spatial frequency re-use / BSS Colouring
Target Wake Time (TWT)
1024-QAM
New PHY headers
Enhanced robustness outdoors

802.11 Protocol Analysis Tools and Methodology
Troubleshooting methodology
Protocol analyser types
Analysis NIC/adapter selection and constraints
Interpreting results based on location
Analyser settings and features
Filtering and channel scanning

Practical 802.11 Protocol Analysis
Interpreting decodes
Using advanced analysis features
Assessing WLAN health and behavior factors
Evaluating network statistics
Troubleshooting common problems
Wired analysis to support wireless network issues

RF Spectrum Analysis Tools and Methodology
Radio frequency behavior review
Visualising RF domains using spectrum measurement tools
Spectrum analyser types and operation
Analyser specifications and characteristics

Practical RF Spectrum Analysis
Understanding spectrum data presentation
Interpreting plots and charts
Common WLAN spectrum analyser features
Identifying transmit patterns
Device classification and network impact
Recognising transmit signatures