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2012-01-18

A+ logical topology AKA signal topology

All LANs connect devices in a way specifying how they're arranged & how they communicate with each other. The cables or wireless system that moves data, the physical structure, is the physical topology. The logical topology, defines how the signals act on the network media, or the way that the data passes through  the network from one device to the next without regard to the physical interconnection of the devices.

Logical topologies are tied to network protocols, or rules, defining how the data moves across a network. Ethernet is now the common logical bus topology protocol.

The logical topology is not necessarily the same as its physical topology. For example, twisted pair Ethernet is a logical bus topology in a physical star layout, whereas old school Ethernet used a physical bus layout.

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