PART Networks 1 This part of the book, Network Processors: Architecture, Programming, and Implementation, is concerned with the first part of its title, Networks. Since network processing is about processing packets and frames in net- works, according to network protocols, demands, and behavior, it is essen- tial to have a thorough knowledge of them before network processing is possible. For example, even analyzing a packet or a frame cannot be done without this understanding because the frame is structured according to the network protocol used, among many other issues. To provide unified terminology for this book, as well as some background