Top 5 Essential Docker Interview Questions & Answers | Part 3: Junior to Pro

Are you preparing for a DevOps, Backend, or Software Engineering interview? Welcome to Part 3 of our Docker Interview Series: Data & Networking! In this interactive video, we test your knowledge with 5 of the most-asked Docker storage and networking interview questions, scaling from beginner-friendly warm-ups to genuinely hard, senior-level concepts. Here is how it works: I will present a question, you pause the video and try to answer it out loud, and then I will reveal the expert-level answer! 📌 What we cover in this episode: • Q1 (Very Easy): What happens to your data when a container is removed — and why the writable layer dies with it. • Q2 (Easy): Named volumes vs bind mounts — Docker-managed storage versus a path on your host. • Q3 (Medium): How containers actually talk to each other — same user-defined network, reachable by name via DNS. • Q4 (Hard): EXPOSE vs -p (publish) — what just documents a port, and what actually opens the gate. • Q5 (Very Hard): Container networking under the hood — network namespaces, the veth pair, the docker0 bridge, and iptables. Whether you are a junior developer just getting into containerization or a seasoned Docker engineer debugging real networking issues, this test will show you exactly where you stand. 👇 Drop your score (out of 5) in the comments below! Be honest—did you make it past the checkpoint? Let me know which concept you'd like a dedicated deep-dive video on. 🔔 Don't forget to SUBSCRIBE to learn Docker the easy way and get notified when "Part 4 — Production & Ops" drops!