You type a website name into your browser. Something like example.com. Your computer doesn’t actually know where that website lives. It needs an IP address first, so it sends a DNS query asking, basically, \u201cWhere should I go?\u201d<\/p>\n
Before asking a DNS server on the internet, your device checks places where the answer might already be saved. Your browser can have a cached result. Your operating system can have one too. If neither has the answer, the request goes to a DNS resolver, usually provided by your internet service or another DNS service.<\/p>\n
Say you visit a website you’ve opened recently. The resolver may already know its IP address because it saved the result from an earlier query. If that cached record hasn’t expired, the resolver sends the address straight back.<\/p>\n
That’s why repeated visits often feel quicker. The resolver doesn’t need to start the whole search again.<\/p>\n
Now things get more interesting. If the resolver doesn’t have the answer, it starts asking other DNS servers. It doesn’t simply shout the question at the entire internet.<\/p>\n
First, it can contact a root DNS server. The root server usually doesn’t know the website’s final IP address. Instead, it points the resolver toward the server responsible for the domain’s top-level extension, such as .com.<\/p>\n
The resolver then asks a .com TLD server where it can find the authoritative DNS server for the actual domain. That authoritative server holds the DNS records that tell the world where the domain points.<\/p>\n
\u2022 Root servers are more like signposts. They guide the resolver toward the right part of the DNS system rather than handing over the final address.<\/p>\n
\u2022 TLD servers know where authoritative servers are for domains under their extension, which keeps the lookup moving without making the root layer handle everything.<\/p>\n
\u2022 The authoritative DNS server has the useful record. That’s where the resolver finally gets the domain’s actual DNS information.<\/p>\n
Breaking DNS into layers makes the whole system practical. No single server needs to know every domain on the internet, and resolvers can reuse answers instead of repeatedly asking the same questions.<\/p>\n
Honestly, that caching part is one of the better ideas in internet infrastructure. You type a name, wait for what feels like nothing, and somehow a machine thousands of kilometres away has become reachable.<\/p>","protected":false},"excerpt":{"rendered":"
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