Episode 68: DNS Essentials — Records, Resolution, and Queries
DNS is a critical component of almost every network service, translating human-readable domain names into IP addresses that computers can use. In this episode, we take a comprehensive look at how DNS resolution works, including recursive queries, root hints, and forwarders. We also examine caching behavior and explain how propagation delays can affect name resolution after DNS records are updated.
You’ll learn about the different types of DNS records, including A, AAAA, MX, CNAME, PTR, and SRV, and understand what each one is used for. We explain common DNS issues like misconfigured records, unreachable name servers, and DNS poisoning attacks. With tools like nslookup and dig, we demonstrate how to diagnose and fix common problems. This episode ensures you understand the most essential naming system in networking, from both a user and administrative perspective.
