A. Ethernet or 10BaseT or Cat5 cable
        Four pairs of copper wire and an RJ45 Jack
        Speed: Currently 10 Megabits per second.
                    Can be boosted to 100 Megabits per second (100BaseT) called FAST Ethernet.
                    Or, 1000 Megabits per second (1000BaseT) called Gigabit Ethernet.

    B. ThinNet or 10Base2 cable
        Single Shielded cable with core of many wires
        Speed: Currently 10-100 Megabits per second,
            May be faster in the future.

    C. Cable-TV cable
        Speed: 10 Megabits per second (downstream) with a cable modem.

    E. Thick Ethernet cable
        Coaxial (double shielded) heavy duty cable.
        Speed: 100 Megabits per second.

II. Fiber Optic Cable
    Glass or optical plastic fibers.
    Speed: 10-100 Gigabits per second per fiber in the lab, usually 100 Megabits commercially.

III. Infrared beam
       Speed: 10 Megabits per second.

IV. Radio Waves: Microwaves using towers or satellites.
       Speed: 100 Megabits per channel.
       Ex. 802.11b protocol