Docker Networking
4 Topics
1
Docker Networking Overview — Bridge, Host, None, Overlay
Understanding how Docker isolates networks on a host.
A core concept in container systems architecture. Interviewers will test your understanding of docker network namespaces, local bridge ports, and the performance differences between bridge and host drivers.
2
Container-to-Container Communication — Same Host
Direct communication via user-defined bridge networks.
Very common in system integrations. Interviewers will check if you know why default bridge networks fail at DNS resolution and how custom user-defined bridges enforce network boundaries.
3
Container DNS and Service Discovery in Docker
How container name resolution works out-of-the-box.
Crucial for understanding how microservices wire together, how DNS queries route through the host, and how Docker manages internal resolution layers.
4
Exposing Containers to the Outside World — Port Mapping and Reverse Proxies
Configuring port translations and routing ingress via Nginx/Traefik.
Highly relevant for platform engineers. You must explain how external client traffic enters a host network card and reaches private container ports, including the role of iptables.