Day 11

Switching Concepts

Key Topics

Today we review the concepts behind how switching works and how virtual LANs (VLANs) can improve switching performance.

Evolution to Switching

Today’s LANs almost exclusively use switches to interconnect end devices; however, this was not always the case. Initially, devices were connected to a physical bus, a long run of coaxial backbone cabling. With the introduction of 10BASE-T and UTP cabling, the hub gained popularity as a cheaper, easier way to connect devices. But even 10BASE-T with hubs had the following limitations:

  • A frame sent from one device ...

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