Container networking in Computer Networks - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is container networking?

Container networking is the way containers communicate with each other and with the outside world using network connections.

beginner

Name a common network model used by containers to communicate within the same host.

The bridge network model is commonly used for containers to communicate within the same host by connecting them to a virtual bridge.

beginner

What is the purpose of port mapping in container networking?

Port mapping connects a port on the host machine to a port inside the container, allowing external access to container services.

intermediate

Explain the difference between 'host' and 'bridge' network modes in containers.

In 'host' mode, containers share the host's network stack directly, while in 'bridge' mode, containers get their own network namespace connected via a virtual bridge.

intermediate

What role do container network interfaces (CNIs) play?

CNIs are plugins that configure network interfaces for containers, enabling them to connect to different network types and manage IP addresses.

Which network mode allows a container to use the host's network directly?

A Host mode

B Overlay mode

C Bridge mode

D None mode

Host mode lets containers share the host's network stack directly.

What does port mapping in container networking do?

A Connects containers to each other

B Maps container ports to host ports for external access

C Creates a virtual network bridge

D Assigns IP addresses to containers

Port mapping links a container's port to a host port so outside users can access container services.

Which plugin type is used to manage container network interfaces?

A VPN

B DNS

C CNI

D HTTP

CNI (Container Network Interface) plugins configure container network interfaces.

What is the main purpose of the bridge network in container environments?

A To isolate containers from each other

B To provide internet access to containers

C To connect containers across different hosts

D To connect containers on the same host

Bridge networks connect containers on the same host so they can communicate.

Overlay networks in container networking are mainly used to:

A Connect containers across multiple hosts

B Connect containers on the same host

C Assign IP addresses to containers

D Map ports from host to container

Overlay networks allow containers on different hosts to communicate securely.

Describe how containers communicate within the same host and how port mapping helps external access.

Think about virtual bridges and how outside users reach container apps.

Explain the difference between host network mode and bridge network mode in container networking.

Consider how containers share or separate network resources.