This book assumes that you have the basic understandings of networking protocols and the Python language. In my experience, a typical system, network engineer, or developer might not remember the exact TCP state machine on a daily basis (I know I don't), but he/she would be familiar with the basics of the OSI model, the TCP and UDP operations, IP headers, and more such.

This chapter will do a very quick revision on the relevant networking topics. In the same view, we will also do a high-level review on the Python language, just enough so that readers who do not code in Python on a daily basis can have a ground to walk on for the rest of the book.

Specifically, we will cover the following topics:

• The internet overview
• The OSI and client-server Model
• TCP, UDP, IP protocol Suites
• Python syntax, types, operators, and loops
• Extending Python with functions, classes, and packages

Worry not if you feel you need further information, as by no means do I think the information presented in this chapter is exhaustive. Do check out the reference section for this chapter to read more on your topic of interest.