With this kind of switching, it was clear that the router could not handle packets fast enough to attain the speeds needed as the traffic flows were increasing at a rapid pace across the networks. The router CPU is responsible of choosing the appropriate process to handle the packet and scheduling the running of the process. Process switching is the oldest and slowest switching methods because it must examines the routing table, determines which interface the packet should be switched to and then switches the packet for every coming packet. There are three main packet switching methods: Process Switching, Fast Switching and Cisco Express Forwarding (CEF). Packet Switching is the method of moving a packet from a router’s input interface to an output interface.
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