CISSP Exam Note (Telecommunications and Networking Security Domain) – LAN Media Access Methods

April 2, 2010 · Posted in Don's eBook Report, IT Docs, InfoSec Docs, Information Security, Information Technology, eBooks, etc... 

LAN Media Access Methods

  • Physical & Data Link Layers
  • Controls the use of a network

Ethernet 802.3

  • Uses CSMA/CD
  • Designed for sporadic traffic
  • Defines a bus topology with 3 different cabling standards:
    • Thinnet (10Base2) – coax with segments up to 185 meters
    • Thicknet (10Base5) – coax with segments up to 500 meters
    • Unshielded Twisted Pair (UTP) – all devices connected to a hub or a switch


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ARCNet (802.5)

  • Early LAN technologies
  • Uses token passing in a Star topology on coax cable

Token Ring

  • Second to Ethernet
  • All end stations connected to a Multistation Access Unit (MSAU)
  • One station is designated as the Active Monitor
  • IF a transmitting station fails, the Active monitor will remove the token and generate a new one

Fiber Distributed Data Interface (FDDI)

  • Dual token ring LAN at 100 MBps on Fiber
  • Dual counter rotating rings only one active at a time
  • Operates over long distances with minimal interference
  • Predictable delays, deterministic
  • Permits several tokens to be present at a time
  • Expensive and requires special expertise
  • Copper Distributed Data Interface – can be used with UTP cable, but subject to interference and length issues associated with copper

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