Cisco is the world's largest manufacturer of network routers and switches. A router is like a traffic light; it manages traffic. In this case it is network traffic. The Internet runs on routers. Cisco also makes switches. These devices tie PCs, printers, and other network devices together. They are able to see and communicate with one another. A router is a layer 3 device using the 7 layer OSI model. A switch is a layer 2 device. They communicate differently. A router uses an IP (Internet Protocol) address for communication, while a switch communicates with a MAC (Machine) address. The two have different functions and have multiple dimensions. The Bright Hub Guide to Cisco will take you through those dimensions to inform and educate you.

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