Free Names and the web lessonsNames and the web · Stage 0 · Names · Step 1
How DNS resolves a name
Follow a lookup from your laptop through a resolver, the root, a TLD server and an authoritative server. About 14 minutes.
A recursive resolver has an empty cache and is asked for www.example.com. Which server does it ask first?
- AA root server
- BThe authoritative server for example.com
- CA .com server
Show the answer
A root server. It starts at the top of the hierarchy and follows referrals downward.
4 questions on this idea
Short questions that apply the idea to new cases: trace it, work out a number, put steps in order. A wrong answer explains itself.
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