What is a switch?
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A switch is an electronic device that connects or disconnects the conducting path in an electronic circuit. It diverts or interrupts electric current from one conducting path to another.
A network switch connects devices in a network to each other, enabling them to talk by exchanging data packets. Switches can be hardware devices that manage physical networks or software-based virtual devices. A network switch operates on the data-link layer, or Layer 2, of the Open Systems Interconnection model.