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Switched Networks and Related Technologies

CISSP

  1. Coaxial Cable
    • Usage: Supports many workstations but has limitations in length.
    • Standard: 1000Base-T supports up to 100 meters using twisted pair cables.
  2. Twisted Pair Cables
    • Interference: Cat 5 offers better interference resistance compared to Cat 3.
    • Fiber Optics: Immune to EMI but can be fragile and costly, requiring expertise for installation and maintenance.
  3. Ethernet Twisted Pair
    • Resilience: More resistant to interference compared to coaxial cables.
  4. Token Ring
    • Mechanism: Uses a token passing method where every station passes a token.
    • Vulnerability: A NIC set to the wrong speed or an error can take down the entire network.
  5. Fiber Distributed Data Interface (FDDI)
    • Structure: A form of token ring with a second ring that activates upon detecting an error.
  6. Leased Lines
    • Redundancy: Uses multiple lines and/or vendors to provide fault tolerance and redundancy.
  7. Frame Relay WAN
    • Operation: Functions over a public switched network, offering high fault tolerance by rerouting faulty segments to working paths.
  8. Speed References:
    • T-1: 1.544 Mbps.
    • T-3: 44.736 Mbps (often rounded to 45 Mbps).
    • ATM (Asynchronous Transfer Mode): 155 Mbps.
    • ISDN (Integrated Services Digital Network): 64 or 128 Mbps.
    • CAT 3 UTP: 10 Mbps.
    • CAT 5 UTP: 100 Mbps.
    • CAT 5e/6 UTP: 1,000 Mbps (1 Gbps).

These notes cover a broad spectrum of network cabling types, their applications, and their respective data transmission speeds, providing insight into the various technologies used in switched networks.

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