Fully connected network

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A diagram of a fully connected network

A fully connected network is a communication network in which each of the nodes is connected to each other. A fully connected network doesn't need to use switching nor broadcasting. However, its major disadvantage is that the number of connections grows quadratically with the number of nodes, per formula

c= \frac{n^2-n}{2}.\,

and so it is extremely impractical for large networks. A two-node network is technically a fully connected network.

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