DNS Uses TCP or UDP? | Most Developers Get This Wrong #dns #coding #computerscience

Does DNS use TCP or UDP? Most developers confidently answer this — and still get it wrong. In this video, I explain how DNS actually works, when it uses UDP, when it switches to TCP, and why both exist — in a simple, practical way. You’ll learn: Why DNS usually uses UDP When and why DNS uses TCP What happens when DNS response is large DNS in real-world systems (browsers, APIs, microservices) Common system design & interview traps around DNS This video is especially useful for: Backend Developers System Design & Networking Interviews Node.js / Web Developers Anyone preparing for FAANG / Product Company interviews 📌 Content explained in simple Hindi-English (Hinglish) so developers across India, Bangladesh, Nepal, USA, Singapore, Australia, Canada, and other Hindi-speaking regions can easily understand.