How does a router switch a packet? What is the difference between routing a packet, switching a frame, and packet switching? What is the Cisco Express Forwarding (CEF) feature referred to in Cisco documentation and commonly found in Cisco I's commands? CEF is a general term that describes the mechanism by which Cisco routers and Catalyst switches packet-switch (route) frames. CEF is found in almost all Cisco routers and Catalyst switches, and understanding how CEF operates can improve the performance, scalability, and efficiency of your network.Cisco Express Forwarding demystifies the internal workings of Cisco routers and switches, making it easier for you to optimize performance and troubleshoot issues that arise in Cisco network environments. This book addresses common misconceptions about CEF and packet switching across various platforms, helping you to improve your troubleshooting skills for CEF- and non-CEF-related problems.