Chapter 6. DNS Queries in Action
By the time we're done with this chapter, you will understand how queries are formed and why they matter.
You will know how those queries originate from a resolver and find their way to the ultimate authoritative nameserver that will send back the response, and you will understand how nameservers are selected in the course of a query/response cycle.
Then, we'll look inside those queries so that you can see what the contents of those queries mean.
In this chapter, we will look at:
- Top-level domain nameservers (DNS)
- Nameserver order
- The anatomy of a DNS lookup
- When DNS uses TCP instead of UDP
- How nameserver selection works
Let's start at the top of the DNS tree.
