CWNA

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Author:
Tjr31
ID:
43187
Filename:
CWNA
Updated:
2010-10-18 21:11:38
Tags:
CWNA
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Description:
CH 7 and 8
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  1. Wireless Wide Area Network
    (WWAN)
    • Covers a vast geographical area
    • May use cellular technologies
    • 802.11wireless networking infrastructure
    • cannot be deployed as WWAN
  2. Wireless Metropolitan Area
    Network (WMAN)
    • Covers a smaller geographical area such as a city
    • May use 802.16 technology
    • Used as a backhaul
    • Competes with DSL and Cable internet connections
  3. Wireless Personal Area Network (WPAN)
    • Used within a close proximity
    • Connects PDA’s, Phones, Laptops, Ear pieces and etc.
    • Uses Bluetooth 802.15
    • Uses ZigBee
    • Low Bandwidth and Throughput are Normal with
    • WPAN use
  4. Wireless Local Area Network (WLAN)
    • Defined in 802.11-2007
    • Refined in 802.11 Amendments
    • May include several AP’s
    • Common in SOHO Networking
    • Increasingly Common in Enterprise Networking
  5. Basic Service Set (BSS)
    An Access Point (AP) and any associated Stations
  6. Extended Service Set (ESS)
    • The communication between multiple access points that share a network infrastructure
    • Is one or more basic service sets that share a distribution system medium.
  7. Independent basic service set(IBSS)
    • Involves direct communication between 802.11 client stations without the use of an access point
    • Known as peer to peer network or an ad hoc network
  8. 802.11 Configuration Modes
    • Access Point Modes
    • –Bridge Mode
    • –Workgroup Bridge Mode
    • –Repeater Mode
    • –Root Mode
    • –Scanner Mode

    • •Station Modes
    • –Infrastructure Mode
    • –Ad Hoc Mode
  9. Distribution System (DS)
    • •Interconnects a set of basic service sets
    • (BBS) via integrated LAN’s creating an Extended Service Set (ESS)
    • Used for transport of traffic as well as services used for transport of traffic
  10. Distribution System Medium (DSM)
    logical physical medium used to connect access points 802.3 backbone
  11. Distribution System Services
    (DSS)
    • used to manage client associations, reassociations, and diassociations
    • A system service built inside an autonomous access point or WAN controller usually in the form of software
  12. Wireless Distribution System (WDS)
    • A DS that uses the Wireless Medium
    • connects accesspoints together
    • Examples include:
    • –Bridges
    • –Repeaters
    • –Wireless Mesh Networks
  13. Service Set Identifier
    (SSID)
    • The logical name used to identify a wireless
    • network
    • Made up of 32 characters and is lower case
  14. Basic Service Set Identifier (BSSID)
    • The 48 bit MAC address used by
    • the AP in a Basic Service Set (BSS
  15. Integration Service (IS)
    • Enables (Mac Service Data Unit) MSDU’s to be
    • Delivered between the non-802.11 LAN and the Distribution System
    • A Frame Format Transfer Method
  16. CSMA/CA vs. CSMA/CD
    • -Collision Detection
    • More Efficient
    • Less Overhead
    • Transmits and listens for collisions
    • -Collision Avoidance
    • Less Efficient
    • More Overhead
    • Listens to medium prior to transmission
  17. Physical Carrier Sense
    • Performed by stations not Transmitting or Receiving
    • Listening for any 802.11 traffic
  18. Virtual Carrier Sense
    • Uses a logical timer called the Network Allocation Vector (NAV)
    • Stations can not transmit unless the NAV value is 0
  19. interframe spacing (IFS)
    a peroid of tie that exists between transmissions of wireless frames.
  20. Random Back-off Timer
    • Final Timer used prior to Transmission
    • Reduces the Chance the two or more Wireless
    • Stations Transmit Simultaneously
  21. Distributed Coordination Function (DCF)
    • Mandatory access mode of 802.11 standard
    • Provides CSMA/CA
    • Main Components Include:
    • –Interframe Space
    • –Virtual Carrier Sense
    • –Physical Carrier Sense
    • –Random Back-off Timer
  22. Point Coordination Function (PCF)
    • Is a form of Polling
    • The AP acts as a Point Coordinator
    • Only works within a BSS
    • Optional Contention Method
    • Has a great deal of Overhead
    • Not currently Implemented
  23. Hybrid Coordination Function (HCF)
    • Introduced in 802.11e
    • Uses Transmit Opportunities
    • –Period of time to transmit
    • –Assigns Priority to traffic
    • •Creates two Access Methods
    • –Enhanced Distributed Channel Access (EDCA)
    • –HCF Controlled Channel Access
  24. the use of TXOPs and access categories in EDCA as well as the use of TXOPs and polling during HCCA
  25. Network Allocation Vector (NAV)
    a timer mechanism that maintains a prediction of future traffic on the medium based on duration value information seen in a previous frame transmission

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