Ethernet Cabling

Ethernet cabling is an important discussion, especially if you are planning on taking the Cisco exams. Three types of Ethernet cables are available:

  1. Straight-through cable
  2. Crossover cable
  3. Rolled cable
  • Straight-Through Cable

    The straight-through cable is used to connect Host to switch or hub, Router to switch or hub Four wires are used in straight-through cable to connect Ethernet devices. It is relatively simple to create this type, the four wires used in a straight-through Ethernet cable.

    Notice that only pins 1, 2, 3, and 6 are used. Just connect 1 to 1, 2 to 2, 3 to 3, and 6 to 6 and you’ll be up and networking in no time. However, remember that this would be an Ethernet-only cable and wouldn’t work with voice, Token Ring, ISDN, and so on.
  • Crossover Cable

    The crossover cable can be used to connect Switch to switch, Hub to hub, Host to host, Hub to switch Router direct to host The same four wires are used in this cable as in the straight-through cable; we just connect different pins together. Instead of connecting 1 to 1, 2 to 2, and so on, here we connect pins 1 to 3 and 2 to 6 on each side of the cable.
  • Rolled Cable

    Although rolled cable isn’t used to connect any Ethernet connections together, you can use a rolled Ethernet cable to connect a host to a router console serial communication (com) port. If you have a Cisco router or switch, you would use this cable to connect your PC running Hyper Terminal to the Cisco hardware. Eight wires are used in this cable to connect serial devices, although not all eight are used to send information, just as in Ethernet networking.

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