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Tuesday, February 16, 2010

Topology in Distributed systems

The sites in the system can be connected physically in a variety of ways. While choosing a topology, following criteria should be kept in mind : Basic cost, Communication cost and Reliability.

Mesh Networks : The value of fully meshed networks is proportional to the exponent of the number of subscribers, assuming that communicating groups of any two endpoints, up to and including all the endpoints.

- Fully Connected Networks
The fully-connected connected network topology, also referred to as a mesh topology, requires that all the terminals be connected to all the other terminals, as it's name implies.
Advantages: A fault in one terminal on the network will not effect the rest, as the data has multiple redundancy paths, depending on the size of the network, that are open to it.When network usage is high, data packets can be transmitted via different cables, thereby reducing network clogging - keeping data transfer rates at an acceptable level.
Disadvantage : A large amount of cabling is required.

Fully Connected Networks

- Partially connected Networks
The type of network topology in which some of the nodes of the network are connected to more than one other node in the network with a point-to-point link รข€“ this makes it possible to take advantage of some of the redundancy that is provided by a physical fully connected mesh topology without the expense and complexity required for a connection between every node in the network.
In most practical networks that are based upon the physical partially connected mesh topology, all of the data that is transmitted between nodes in the network takes the shortest path (or an approximation of the shortest path) between nodes, except in the case of a failure or break in one of the links, in which case the data takes an alternative path to the destination.

Partially Connected Network

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