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Subnetting and Supernetting

Discuss the importance of subnetting with respect to collisions, broadcasts and controlling traffic. Discuss the difference between subnetting and supernetting.

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In early networks with hubs, throughput on the network was low and performance was poor because all stations were part of the same collision domain. What this meant was that if station A was sending data and B wanted to send before A completed its transmission, a collision would occur. Neither station would successfully finish sending its data, and both would have to wait a random amount of time before retrying to send (the backoff algorithm of Ethernet). In this case, all stations are on the same collision domain, because a collision would occur if more than one station tried to transmit. There was no hierarchy in the network, as all stations were part of the same "flat" topology.

With the advent of switched networks, a switch would divide this one big collision domain into multiple domains, one per switch-port. In other words, if five stations were connected to the switch, each station would be in its own collision domain with the respective port on the switch to which it is connected. Now, multiple stations could send data simultaneously as the switch ...

Solution Summary

This solution discusses subnetting and supernetting.