Explain the purpose of DNS and how it works in simple terms.
Direct Answer
This networking question checks your understanding of how human-readable addresses are resolved to IP addresses.
Why Interviewers Ask This
DNS is the backbone of internet connectivity; candidates must know how it translates domains to IPs. Interviewers assess your grasp of distributed systems and resolution hierarchies. Understanding DNS is vital for troubleshooting connectivity issues and designing scalable network architectures.
How to Answer This Question
Start with the analogy of a phonebook mapping names to numbers. Describe the recursive query process from the browser to the root server. Mention caching at different levels to improve speed. Briefly touch upon A records and CNAMEs.
Key Points to Cover
- Domain to IP translation
- Hierarchical server structure
- Caching benefits
- Resolution process
Sample Answer
DNS acts like the internet's phonebook, translating human-friendly domain names like flipkart.com into machine-readable IP addresses. When you type a URL, your browser queries a local resolver, which contacts root server…
Common Mistakes to Avoid
- Skipping the hierarchy explanation
- Confusing DNS with HTTP
- Not mentioning caching
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