IntermediatePhone
2 min
How DNS Resolution Works
DNSNetworkingWeb
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Interview Question
Walk me through the steps when you type a URL into your browser and press enter.
Key Points to Cover
- Browser cache lookup first
- OS resolver cache check
- Recursive DNS query to resolver
- Authoritative nameserver lookup
- Response cached and IP returned
Evaluation Rubric
Mentions local caches first25% weight
Explains DNS recursive resolver25% weight
Mentions authoritative nameservers25% weight
Describes IP returned to browser25% weight
Hints
- 💡Start with browser cache, end with IP resolved.
Potential Follow-up Questions
- ❓What’s the role of TTL?
- ❓How does DNSSEC fit in?
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