This chapter taught us some very valuable timing flags—Nmap is versatile enough to include many options that can help us make sure we have complete control over timing, in order to maximize efficiency and overcome potential pitfalls.

In this chapter, we covered basic Nmap timing optimization, customized host group sizes, how to increase or decrease Nmap's parallelism, how to deal with stuck hosts, and how to delay (or increase the rate of) individual packets.

In the next chapter, we will talk about one of the most interesting and powerful features of Nmap: the Nmap Scripting Engine (NSE). We'll talk about what the NSE is, what it can do, and how to invoke interesting scripts using it.