The DNS service is key for modern infrastructures. Maintaining a healthy DNS infrastructure ensures service and resource availability. In this chapter, we covered the basics of DNS and you learned why it's important. Then, we moved on to the hierarchical naming structure and saw how it helps translate organization logical structure to the domain namespace. We also learned how exactly DNS works behind the scene. Then, we looked at DNS records and DNS zones. This also included some explanation on how to create different zones. At the end of the chapter, you learned about different DNS operation modes and replications. I hope this information helps you understand the importance of DNS in an infrastructure and how to use it properly.

In next chapter, we will look at the AD FSMO roles and explore how to place them correctly in an infrastructure.