Certified - CompTIA Network +

DNS issues are notoriously deceptive—everything looks connected, but nothing loads. In this episode, we explore how DNS resolution works step by step and why it often causes issues that masquerade as general connectivity problems. You'll learn how to diagnose common failures like unreachable DNS servers, misconfigured DNS clients, and issues with recursive vs. authoritative name resolution. We also cover how split-horizon DNS and DNS forwarding can create internal resolution inconsistencies.

You’ll gain hands-on knowledge of how to use tools like nslookup, dig, and ping to isolate where the breakdown occurs. We discuss TTL expiration, DNS caching behavior, and how propagation delays can affect domain changes. DNS issues don’t just break websites—they break email, VPNs, updates, and more. By the end of this episode, you’ll be equipped to tackle one of the most common and critical troubleshooting challenges in any environment.