Explain the purpose of DNS and how it works in simple terms.
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 servers, then TLD servers, and finally authoritative servers to find the IP. This hierarchical lookup uses caching at every step to reduce latency. Understanding this flow helps in diagnosing why a site might be unreachable or slow to load.
Common Mistakes to Avoid
- Skipping the hierarchy explanation
- Confusing DNS with HTTP
- Not mentioning caching
Practice This Question with AI
Answer this question orally or via text and get instant AI-powered feedback on your response quality, structure, and delivery.
Related Interview Questions
What is Object-Oriented Programming in Java?
Medium
GoogleHow does exception handling work in Java and what is the difference between throw and throws?
Medium
TCSExplain company process?
Easy
TCSDo you know Java? What are some of its key features?
Easy
TCSWhat is ER model in the DBMS?
Medium
FlipkartWhat is the difference between authentication and authorization?
Easy
Flipkart