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Network Media (UTP Cabling (Connectors (Each time copper cabling is…

- - - - When two wires in an electrical circuit are placed close together, their magnetic fields are the exact opposite of each other.
    - - To further enhance the cancellation effect of paired circuit wires, designers vary the number of twists of each wire pair in a cable.
  - - - Cable types
      - Cable lengths
      - Connectors
      - Cable termination
      - Methods of testing cable
  - - - A cable used to interconnect similar devices.
    - - A Cisco proprietary cable used to connect a workstation to a router or switch console port.
    - - The most common type of networking cable. It is commonly used to interconnect a host to a switch and a switch to a router.
- - - - Enterprise Networks
        
        Used for backbone cabling applications and interconnecting infrastructure devices.
      - Fiber-to-the-Home (FTTH)
        
        Used to provide always-on broadband services to homes and small businesses.
      - Long-Haul Networks
        
        Used by service providers to connect countries and cities.
      - Submarine Networks
        
        Used to provide reliable high-speed, high-capacity solutions capable of surviving in harsh undersea environments up to transoceanic distances.
  - - - Lasers
      - Light emitting diodes
    - - Single-mode fiber (SMF)
        
        Consists of a very small core and uses expensive laser technology to send a single ray of light.
      - Multimode fiber (MMF)
        
        Consists of a larger core and uses LED emitters to send light pulses. Specifically, light from an LED enters the multimode fiber at different angles.
    - - Dispersion refers to the spreading out of a light pulse over time. The more dispersion there is, the greater the loss of signal strength.
  - - - Some fiber connectors accept both the transmitting and receiving fibers in a single connector known as a duplex connector
  - - - Misalignment
        
        The fiber-optic media are not precisely aligned to one another when joined.
      - End gap
        
        The media does not completely touch at the splice or connection.
      - End finish
        
        The media ends are not well polished, or dirt is present at the termination.
    - - Although this does not ensure performance, it is a quick and inexpensive way to find a broken fiber.
- - - - Construction materials in buildings will limit the effective coverage
    - - Wireless can be interfered by cordless phones, fluoroscent lights, microwave ovens, etc.
    - - Devices not authorized for network can access to transmission
    - - The more users to access the WLAN simultaneously, the less bandwidth for each user
  - - - Wi Fi
      - Bluetooth
      - Wi Max
  - - - Wireless access points
        
        Concentrates the wireless signals from users and connects them to a network infrastructure
      - Wireless NIC adapters
        
        Provide wireless communication capability to each network host.
- - - - Potential sources of EMI include radio waves and electromagnetic devices.
    - - Disturbance caused by the electric or magnetic fields of a signal on one wire to the signal in an adjacent wire.
  - - - Used for interconnecting network hosts with intermediate networking devices
    - - Same as UTP but its more protected for interference and more expensive
    - - A cable that consists of two conductors that share the same axis made of copper