Ethernet switch
An Ethernet switch is a link-layer device which stores and forwards Ethernet frames. It examines incoming frame’s MAC address, selectively forwards frame to one-or-more outgoing links when frame is to be forwarded. Switches do not need to be configured, these are plug-and-play and self-learning devices. Self-learning switches can be connected together and perform as a unique switch.
Figure 26 This is an example of self-learning in a switch. The switch table is initially empty. A sends a frame to A’.
When switch receives frame A, it learns A-P1, then floods the ports. A’ responds and then the switch learns A’-P4. In this case the switch selectively sends the response frame to port 1.
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This resource was developed as part of an Erasmus+ project, funded with support from the European Commission under grant agreement 2016-1-SE01-KA203-22064.
The project was a collaboration between:
- The University of Borås, Sweden
- The University of the Highlands and Islands, Scotland
- The University of Alcalá, Spain
- Digital Connections, Scotland
This resource has been released under Creative Commons license CC-BY-SA 4.0.
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- Academic content – The University of Alcalá (https://www.uah.es/en/)
- Technical resource development – The University of the Highlands and Islands Educational Development Unit - EDU (edu@uhi.ac.uk)
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