It is a device that connects multiple network segments.<br>A switch analyzes the MAC address and then determines where to send the data.<br>So a file addressed to a computer reaches only that computer through the use of a switch.<br>The term ?switch? commonly refers to a Network bridge that processes and routes data at the Data link layer (layer 2) of the OSI model.<br><br>Switches that additionally process data at the Network Layer are often referred to as Layer 3 switches or Multilayer switches. Source: CoolInterview.com

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