CISSP Exam Note (Telecommunications and Networking Security Domain) – LAN/WAN Devices, Types and Speeds of Leased Lines, etc.

April 26, 2010 · Posted in Don's eBook Report, Information Security, Information Systems, Information Technology, eBooks, etc... · Comment 

LAN Devices

Repeaters (Layer 1) – amplify signal, no added intelligence, no filtering

Hubs (Layer 1) – used to connect multiple LAN devices, no added intelligence

Bridges (Layer 2)

  • Amplifies signal and adds some intelligence
  • Forwards the data to all network segments if the Media Access Control (MAC) or hardware address of the destination computer is not on the local network segment
  • Automatically forwards all broadcast traffic

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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... · Comment 

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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CISSP Exam Note (Telecommunications and Networking Security Domain) – 5 Common LAN Topologies

March 30, 2010 · Posted in Don's eBook Report, IT Docs, InfoSec Docs, Information Security, Information Systems, Information Technology, eBooks, etc... · Comment 

Topologies – defines the manner in which the network devices are organized to facilitate communication

Bus

  • All transmissions travel full length of the cable and receive by all other stations
  • Single point of failure n the cable
  • If one of the links between any of the computers is broken, the network is down
  • Primarily Ethernet
  • These networks were originally designed to work with more sporadic traffic Read more

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CISSP Exam Note (Telecommunications and Networking Security Domain) – Data Networking Technologies

March 29, 2010 · Posted in Don's eBook Report, InfoSec Docs, Information Security, Information Systems, Information Technology, Internet Docs, eBooks, etc... · Comment 

LAN Cabling Types

Twisted Pair Cable

  • Relatively slow speed
  • Two insulated wires can be shielded (STP0 or unshielded (UTP)
  • UTP is four-pair medium and comes in several categories
  • UTP can be easily tapped by eavesdroppers than the other cable types
  • Category based on how tightly wound the wires are, the tighter the wind the higher the rating and the higher the resistance to interference
  • Cat 1 UTP – was used for telephone lines, not good for data
  • Cat 2 UTP – up to 4 MBps
  • Cat 3 UTP – Used for 10BaseT networks up to 10 MBps
  • Cat 4 UTP – Used in Token Ring Networks up to 16 MBps
  • Cat 5 – Current UTP standard for new installations up to 100MBps
  • Cat 6 UTP – up to 155MBps
  • Cat 7 UTP – up to 1 GBps

You may also want to consider these CISSP resources from Amazon.com

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CISSP Exam Note (Telecommunications and Networking Security Domain) – Data Networking Basics

March 23, 2010 · Posted in Don's eBook Report, InfoSec Docs, Information Security, Information Technology · Comment 

Data Network Types:

  • Local Area Network (LAN)
  • Wide Area Network (WAN)
  • Internet, Intranet and Extranet

You may also want to consider these CISSP resources from Amazon.com

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