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Session 2: NETWORK TOPOLOGY
Each device has a dedicated point-to-point link to every other device
Each device has a dedicated point-to-point link only to a central controller (hub)
One long cable acts as a backbone to link all the devices
Each device has a dedicated point-to-point connection with only the two devices on either side of it
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Advantages: • Eliminating traffic
problems – each connection carries its own data load
• Robustness – if one link fails, it does not incapacitate the whole system
• Privacy/Security – only the intended recipient sees the message
• Easy fault identification
MESH TOPOLOGY
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STAR TOPOLOGY
If one device wants to send data to another, it sends the data to the controller, which relays the data to the other connected device
Advantages:
• Less expensive – each device needs only one link and one I/O port
• Less cabling – easy to install and reconfigure
• Robustness
• Easy fault identification and fault isolation
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BUS TOPOLOGY
Advantages:
• Ease of installation
• Less cabling than mesh and star
Disadvantages:
• A fault or break in the bus cable stops all transmission – the damaged area reflects signals back in the direction of origin, creating noise in both directions
• Difficult fault isolation
• Difficult reconnection. Bus topology has a limited number and spacing of devices connected to a given length of cable to avoid degradation of signal quality
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RING TOPOLOGY
• Signal is passed along the ring in one direction, from device to device, until it reaches the destination
• When a device receives a signal intended for another device, its repeater regenerates the bits and passes the signal
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Advantage:
• Easy to install, reconfigure and fault isolation
Disadvantages:
• Has limitation on the maximum ring length and number of devices
• A break in a simple ring can disable the entire network.
How to solve? Use …
RING TOPOLOGY
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•Draw a bus network consists of six computers
•Draw a hybrid topology with a star backbone and two ring networks
•Draw a hybrid topology with a ring backbone and three bus networks consists of six computers
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WIRELESS MESH
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STAR
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BUS
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RING
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HUB
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ROUTER WIFI
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TERMINATOR
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SWITCHES
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CABLES
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END OF SESSION 2