Multi-Drop Topology
The draw backs of full interconnected network were removed in this topology by using a single cable around all nodes as shown:
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Multi-Drop Topology |
In this topology all nodes are connected via a single link. Single transmission medium is shared by all nodes. Whenever a message is transmitted, sender and destination addresses area attached as tag and message floats on a single available line. Receiver receives it and send back acknowledgement message which again floats on same line. There may be many messages floating at a time, that is why name multidrop configuration. It is also called broadcasting network for LAN's.
The topology is preferred by local area networks where high speed communication channel is required and computers are confined to a small area. As compared to fully connected network the number of physical lines is highly reduced to one line and thus the cost. This is reliable network. Failure of any node does not affect other nodes and the network. Addition of new nodes is very simple as compared to fully connected network. But failure of communication line fails the entire network.
Merits of multidrop topology; Reduction in total physical lines. Reliability is high. Addition of new nodes is easy. Failure of any node does not affect the network functioning for other computer.
Demerits; if line fails, entire system breaks down. Each node must have good and quick decision making capability.
Hybrid Topology
A hybrid topology is simply a combination to two or more than two topologies. The exact shape configuration of the network depends on the needs and the overall organizational structure of the company involved. In some cases, the hybrid topology may have components of star, ring and completely connected networks topologies as shown:
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Hybrid Topology |
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