טכנולוגית Wi-Fi

Introduction

Introduction to Wireless Technologies

• The Wireless media and its properties
• Propagation of wireless signals and coverage
• Bits and symbols over the air
• Modulation and coding techniques
• Throughput of wireless networks
• Quick overview of short wave wireless technologies

WiFi Technology

WiFi – 802.11 based Technology

Introduction to 802.11 x Technology

• The evolution of the IEEE 802.11 standard
• Uses of Wi-Fi technology
• Basic term and terminology
• System elements and their role
• Main network architectures
• Spectrum and channels used by Wi-Fi

Medium access control

• Protocol layering
• Management functions
  • Beacons
  • Scanning
  • Authentication
  • Association
  • Reassociation
  • Disassociation
• Distributed channel access
  • Basic channel access timing
    • SIFS, PIFS, DIFS
    • Random backoff time
    • Random backoff procedure
• Data/ACK frame exchange
  • Fragmentation
  • Duplicate detection
  • Data/ACK sequence overhead and fairness
• Hidden node problem
  • Network allocation vector
    • RTS/CTS frame exchange
  • EIFS
• Enhanced Distributed Channel Access (EDCA)
  • Transmit opportunity
  • Channel access timing with EDCA
  • EDCA access parameters
  • EIFS revisited
  • Collision detect
  • QoS Data frame
• Block acknowledgement
  • Block data frame exchange
• MAC frame formats
• General frame format
• Format of individual frame types
  • Control frames
  • Data frames
  • Management frames

WiFi Direct

• Main features and capabilities

The Physical Layer

• PHY overview of: 802.11a, b, g, n
• Modulation schemes used in WiFi
• Access methods: DSSS, OFDM
• Spectrum, interference and co- existence issues

Orthogonal frequency division multiplexing

• Background and motivation
• OFDM in time frequency description
• Comparison to single carrier modulation
• Calculation of maximum throughput

WiFi Cellular Convergence

• The concept
• System elements and architecture
• From UMA to 3GPP
• ANDSF and its use

802.11n PHY Enhancements

• 802.11 Multiple Antenna Techniques
• 802.11n MAC throughput enhancements
  • Aggregation
  • Block acknowledgement
  • HT-immediate block ack
  • HT-delayed block ack
• Advanced channel access techniques
  • Motivation and basics of PCF
  • PCF limitations
  • HCCA
  • PSMP
• 802.11n Interoperability and coexistence
  • Packet structure review
  • Mixed format high throughput packet structure
  • MHz and 20/40 MHz operation
  • Protection
• 802.11 / Wi-Fi WLAN Security
  • The Importance of WLAN Security
  • General Wi-Fi Security Policy
  • Functional WiFi Security Policy
  • Legacy WLAN Security Mechanisms
  • Misconceptions about 802.11 / Wi-Fi security
  • Broadcasting vs Hiding the SSID
  • MAC address Filtering
  • The insecurities of WEP
  • Modern WLAN Security Mechanisms
  • Wi-Fi Protected Access (WPA)
  • WPA Personal
  • WPA Enterprise
  • WPA v1 vs WPA2
  • Wi-Fi Protected Setup (WPS)
  • Implementing Enterprise Security
  • 802.1x/EAP
  • Wireless Intrusion Protection Systems (WIPS)
  • Baseline Practices for Wireless Security
• Introduction to 802.11 ac
  • 802.11 ac PHY service specification
    • Very High Throughput (VHT) PHY specification
  • 802.11 ac MAC description
  • VHT BSS operation
• WiFi Administration
  • The Stand-Alone Solution
  • Setting up Stand-Alone Access Point Hardware
  • Configuring a Stand-Alone Access Point
  • Managing a Stand-Alone Access Point
  • Configuring Stand-Alone Access Points for Security Implementing Wireless Stand-Alone Bridges
  • Choosing Roles in Radio Network
  • Determining Bridge Path Information
• Tools for measuring Physical layers performance:
  • Channel occupancy
  • RSSI
  • SINR
  • Throughput / Effective link speed
  • Co-channel interferenc

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