How does DNS resolution work

[bob]

You type a domain name into your browser and your machine shoots off a query right away. I see this happen every day when I troubleshoot for folks like you. The local resolver on your system checks its own cache first before doing anything else. If nothing shows up there it reaches out to a recursive server you probably configured in your network settings. But that server might already hold the answer from a recent lookup someone else did.
Perhaps the cache holds an old record so your request gets answered super fast without extra steps. I always tell you to watch the TTL values because they control how long stuff sticks around. Your computer grabs the IP once it finds it and then connects straight to the web server. Or maybe the resolver has nothing so it starts hunting from the top. Now the query moves up to root servers that point the way to the next level.
You watch as the resolver asks those root servers for the top level domain info next. I remember the first time this clicked for me during a late night fix on a client machine. The root points to the TLD server which handles stuff like .com zones. Then that server sends back the nameserver details for the actual domain you want. But your resolver keeps going until it hits the authoritative server that owns the record. Also the answer comes back down the chain with the IP address tucked in.
Perhaps you deal with A records mostly when setting up new machines for users. I find that reverse lookups work the other way around if you need to track an IP back to a name. Your network might have forwarding set so some queries skip ahead to another server you trust. Now caching happens at every stop along the path to cut down repeats. But stale entries can trip you up if you forget to flush them after changes.
You test this whole flow with simple tools to see where things break during admin tasks. I often run into cases where firewalls block the UDP traffic your queries need. The process repeats for subdomains too when you manage complex setups for work. Then the final answer lands in your local cache for the next request. Maybe you tweak settings on the resolver to speed things for your whole team.
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