3.1.3  Network Topology
(classification of network) (internet service) (network architecture) (network topology) (internet overview)

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A network topology refers to :
The layout of the computers and devices in a communications network or
The configuration of a network that consists of cables, computers, and other peripherals.

• Bus Network.

-A bus network consists of a single central
    cable (backbone/trunk), to which all computers and
    other devices connect (node).

-The bus in a bus network transmit data, instructions, and information as a series of signal.

-Those signals are sent as electrical pulses that travel along the length of the cable in both directions.

• Ring Network.

-On a ring network, a cable forms a closed loop
  (ring) with all computers and devices arranged
  along the ring.

-Data transmitted on a ring network travels from
  device to device around the entire ring, in one
  direction (clockwise or counterclockwise)

• Star Network.

-All the computers and other devices on the
  network connect to a central device, thus forming
  a star.