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Ethernet, defined under IEEE 802.3, is one of today’s most widely used data communications standards, and it finds its major use in LAN applications.
For Ethernet communications, the logical topology is a multi-access bus in which devices all use the same shared-media. However, the physical topology of most Ethernet networks today is that of a star or extended star. In the topology, end devices are typically connected, in a point-to-point basis, to a Layer 2 switch.
A Layer 2 switch performs switching and filtering based only on the MAC address. A Layer 2 switch builds a MAC address table that it uses to make forwarding decisions. Typical switch operations are:
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