This book teaches network programming by focusing on the Internet protocols—the kind of network in which most programmers are interested these days, and the protocols that are best supported by the
Python Standard Library. Their design and operation is a good introduction to networking in general, so you might find this book useful even if you intend to target other networks from Python; but the code listings will be directly useful only if you plan on speaking an Internet protocol.
The Internet protocols are not secret or closed conventions; you do not have to sign non-disclosure
agreements to learn the details of how they operate, nor pay license fees to test your programs against
them. Instead, they are open and public, in the best traditions of programming and of computing more
broadly. They are defined in documents that are each named, for historical reasons, a Request For
Comments (RFC), and many RFCs are referred to throughout this book.
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