STAR	BUS	RING
Data is transferred from one node to another through the hub or switch.	Data is transferred from one node to another through the bus in both direction.	Data travels from device to device around the entire ring, in one direction.
Failure of one node will not affect the entire network.	Failure of one node will not affect the entire network.	Failure in any cable or device breaks the loop and will affect the entire network.
All computers and devices are connected to a central device (hub).	All computers and devices are connected to a single central cable.	All computers and devices are arranged along a cable which forms a closed loop(ring).

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ADVANTAGES OF BUS TOPOLOGY

• Inexpensive to install.
• Easy to install.
• Failure of one device usually does not effect the rest of the bus network.
• Use less cable than other physical topologies.

DISADVANTAGES OF BUS TOPOLOGY

• A failure in the central cable will take down the entire network.
• As you add devices, all devices are temporarily prevented from using the network.
• Locating problems such as cable breaks, shorts or bad terminators is difficult.

Network Topology

There are three commonly used network topologies.

• Star
• Bus
• Ring

(A)BUS TOPOLOGY

• Consists of a single central cable, to which all computers and other devices connect.
• The bus is a physical cable that connects the computers and other devices. 
• The bus in a network transmit data, instructions and information as a series of signal. 

Note : Coaxial as a backbone.

• Data, instructions and information transmitted on a bus network travels along the bus in both directions.
• When a sending device transmits data, the address of the receiving device is included with the transmission so that the data is routed to the appropriate receiving device.

Note : Required at each end of the bus cable to prevent the signal from bouncing back.