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The TCP/IP Model – Layer 3
• The device at Layer 3 that we’ll study is the router. A router operates at Layer 3, runs many
different protocols, and uses IP Addresses. Routers keep track of many different IP
networks and allow them to communicate with each other.
• The router also keeps track of the best path to reach another network. For example, if you
are located in the USA and you are connected to a web server in Switzerland, there are
many different paths in between those two locations. So which is the best path to use?
This is another major function that routers perform.
Router Icon
A Cisco Router
