TYPES
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BUS NETWORK TOPOLOGY
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RING NETWORK TOPOLOGY
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STAR NETWORK TOPOLOGY
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DIAGRAM
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EXPLANATION
(PHYSICAL)
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Consists of single central cable(backbone,trunk),to which all computers and other devices connect(node).
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-A cable forms a closed loop (ring) with all computers and devices arranged along the ring.
-Token passing is one method for sending data around a ring.
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All the computers and other devices on the network connect to a central device (hub/switch), thus forming a star.
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EXPLANATION
(LOGICAL)
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-The bus network transmit data,instructions,and information in a series of signal.Those signal transmit data in both directions.
-When sending device transmit data,the address of receiving device
included.If the device address does not match the intended address,the
device ignores the data.If the device does match,the data is accepted.
-All devices receive the data but only the intended recipient accept the data.
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-The
token along with any data is sent from the first device to the second
device which extracts data address to it and add any data it wish to
send.
-Then second device passes the token and data to the third device until it comes back to the first device again.
-Only the intended recipient accept the data,the rest will ignore the data.
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-The device that provides common central connection point for other devices on a network is hub/switch.
-All data that transfers from one device to another passes through hub or switch.
-The hub takes any signal that comes from any device and passes it along to all other devices in a network.
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ADVANTAGES
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-Bus networks are inexpensive and easy to install.
-Failure of one device usually does not affect the rest of bus network.
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-Cable faults are easily located, making troubleshooting easier.
-The uses of token passing enable all devices in ring topology to share network resources fairly.
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-If one device fails,only that device is affected.
-Easy to troubleshoot and isolate problem.
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DISADVANTAGES
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-Because
all systems on the network connect to single cable or backbone,a break
in the cable will prevent all systems from accessing the network.
-It is difficult to identify the problem if entire network shut down.
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-A failure in any cable or device breaks the loop and can take down entire network.
-Data packets must pass through every computer,therefore this makes it slower.
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-If the hub or switch fails, the entire network will be inoperable.
-Requires more cable than most of the other topologies.
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