Definition
Routing refers to the process of selecting paths in a network along which to send network traffic. Routers examine the destination IP address of a data packet and consult their routing tables to determine the best next hop towards the packet's ultimate destination. This intelligent forwarding ensures that data reaches its intended recipient efficiently across interconnected networks. In practice, routers dynamically learn and update routes using protocols like OSPF or BGP, adapting to network changes. Understanding routing is crucial for network administrators to ensure reliable connectivity and optimize data flow. For instance, a router at an internet service provider directs your web requests to the correct server farm. Unlike simple switching which operates at the data link layer, routing operates at the network layer to connect different IP subnets. This concept is fundamental to domains like network infrastructure and security, appearing on certifications such as CompTIA Network+ and CISSP.