Lan switching and wireless pdf

A network switch also called switching hub , bridging hub , officially MAC bridge [1] is networking hardware that connects devices on a computer network by using packet switching to receive, and forward data to the destination device. A network switch is a multiport network bridge that uses media access control addresses to forward data at the data link layer layer 2 of the OSI model. Some switches can also forward data at the network layer layer 3 by additionally incorporating routing functionality. Such switches are commonly known as layer-3 switches or multilayer switches. Switches for Ethernet are the most common form of network switch. The first Ethernet switch was introduced by Kalpana in

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