Bridge network default behavior in Docker - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the default network driver used by Docker when no network is specified?

Docker uses the bridge network driver by default. It creates a private internal network on the host for containers to communicate.

beginner

How does Docker's default bridge network handle container IP addressing?

Docker assigns each container a unique IP address within the bridge network's subnet, allowing containers to communicate using these IPs.

intermediate

Can containers on the default bridge network communicate with each other by container name?

No, containers on the default bridge network cannot resolve each other by name. They must use IP addresses or user-defined networks for name resolution.

intermediate

What is the role of NAT in Docker's default bridge network?

Docker uses Network Address Translation (NAT) to allow containers on the bridge network to access external networks like the internet through the host.

beginner

How can you inspect the default bridge network configuration in Docker?

Use the command docker network inspect bridge to see details like subnet, gateway, and connected containers.

What is the default subnet used by Docker's bridge network?

A 172.17.0.0/16

B 192.168.0.0/24

C 10.0.0.0/8

D 127.0.0.1/32

Docker's default bridge network typically uses the subnet 172.17.0.0/16 for container IP addressing.

Can containers on the default bridge network communicate with each other using container names?

A Yes, by default

B Only on Windows hosts

C No, they must use IP addresses

D Only if linked explicitly

Containers on the default bridge network cannot resolve each other by name; they must use IP addresses or user-defined networks.

What command shows detailed info about the default bridge network?

A docker network ls

B docker inspect container

C docker ps -a

D docker network inspect bridge

The command 'docker network inspect bridge' displays detailed configuration of the default bridge network.

How does Docker allow containers on the bridge network to access the internet?

A Using NAT through the host

B Direct public IP assignment

C VPN tunneling

D Containers cannot access the internet

Docker uses Network Address Translation (NAT) on the host to enable containers to access external networks.

Which of these is true about the default Docker bridge network?

A It assigns public IP addresses to containers

B It isolates containers from the host network

C It allows automatic DNS resolution by container name

D It requires manual IP assignment

The default bridge network isolates containers from the host network using a private subnet and NAT.

Explain how Docker's default bridge network manages container communication and external access.

Think about how containers talk to each other and the outside world.

Describe how to inspect and understand the configuration of Docker's default bridge network.

Use Docker commands to explore network details.