Network+ Chapter 15 Definitions

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  1. Ad Hoc Mode
    A wireless networking mode where each node is in direct contact with every other node in a decentralized free-for-all.  Ad hoc mode is similar to the mesh topology
  2. Infrastructure Mode
    Mode in which wireless networks use one or more WAPs to connect the wireless network nodes centrally.  This configuration is similar to the star topology of a wired network.
  3. Independent Basic Service Set (IBSS)
    A basic unit of organization in wireless networks formed by two or more wireless nodes communicating in ad hoc mode.
  4. ICS (Internet Connection Sharing)
    Also known simply as Internet Sharing, the technique of enabling more than one computer to access the internet simultaneously using a single Internet connection.  When you use Internet sharing, you connect an entire LAN to the Internet using a single public IP address.
  5. Basic Service Set (BSS)
    In wireless networking, a single access point servicing a given area.
  6. Extended Service Set (ESS)
    A single wireless access point servicing a given area that has been extended by adding more access points.
  7. Wireless Access Point (WAP)
    Connects wireless network nodes to wireless or wired networks.  Many WAPs are combination devices that act as high-speed hubs, switches, bridges, and routers, all rolled into one.
  8. Basic Service Set Identifier (BSSID)
    Naming scheme in wireless networks.  Defines the most basic infrastructure mode network-A BSS of one WAP and one or more wireless nodes.
  9. Service Set Identification (SSID)
    A 32-bit identification string, sometimes called a network name, that's inserted into the header of each data packet processed by a wireless access point.
  10. Spread-Spectrum
    Broadcasts data in small, discrete chunks over the different frequencies available within a certain frequency range.
  11. Extended Service Set Identifier (ESSID)
    An SSID applied to an Extended Service Set as a network naming convention.
  12. Direct-Sequence Spread-Spectrum (DSSS)
    A spread-spectrum broadcasting method defined in the 802.11 standard that sends data out on different frequencies at the same time.
  13. Frequency-Hopping Spread Spectrum (FHSS)
    A spread spectrum broadcasting method defined in 802.11 standard that sends data on one frequency at a time, constantly shifting (or hopping) frequencies.
  14. Orthogonal Frequency-Division Multiplexing (OFDM)
    A spread-spectrum broadcasting method that combines the multiple frequencies of DSSS with FHSS's hopping capability.
  15. CSMA/CA(Carrier Sense Multiple Access with Collision Avoidance)
    Access method used mainly on wireless networks.  Before hosts send out data, they send out a signal that checks to make sure the network is free of other signals.  If data is detected on the wire, the hosts wait a random time period before trying again.  If the wire is free, the data is sent out.
  16. Interframe Gap(IFG)
    A short, predefined silence used in CSMA/CA.
  17. Distributed Coordination Function (DCF)
    One of two methods of collision avoidance defined by the 802.11 standard and the only one currently implemented.  DCF specifies strict rules for sending data onto the network media.
  18. Point Coordination Function (PCF)
    A method of collision avoidance defined by the 802.11 standard, which has yet to be implemented.
  19. Channel Bonding
    Wireless technology that enables WAPs to use two channels for transmission.
  20. Multiple In/Multiple Out (MIMO)
    A feature 802.11 WAPs that enables them to make multiple simultaneous connections.
  21. Transmit Beamforming
    A multiple-antenna technology in 802.11n WAPs that helps get rid of dead spots.
  22. MAC Address Filtering
    A method of limiting access to a wireless network based on the physical addresses of wireless NICs.
  23. Access Control List (ACL)
    A clearly defined list of permissions that specifies what actions an authenticated user may perform on a shared resource.
  24. Wired Equivalent Privacy (WEP)
    A wireless security protocol that uses a 64-bit or 128-bit encryption algorithm to scramble data packets.
  25. Rivest Cipher 4 (RC4)
    A popular streaming symmetric-key algorithm.
  26. Wi-Fi Protected Access (WPA)
    A wireless security protocol that address the weaknesses and acts as a sort of upgrade to WEP.  WPA offers security enhancements such as dynamic encryption key generation (keys are issued on a per-user and per session basis(, an encryption integrity-checking feature, user authentication through the industy-standard Extensible Authentication Protocol (EAP), and other advanced features that WEP lacks.
  27. Temporal Key Integrity Protocol (TKIP)
    The extra layer of security that WPA adds on top of WEP.
  28. 802.1X
    A port-authentication network access control mechanism for networks.
  29. Wi-Fi Protected Access 2 (WPA2) Enterprise
    A version of WPA2 that uses a RADIUS server for authentication.
  30. Power over Ethernet (PoE)
    A standard that enables WAPs to receive their power from the same Ethernet cables that transfer their data.
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Network+ Chapter 15 Definitions
2013-04-12 19:18:54
Wireless Networking

Wireless Networking
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