DCA DCA Docker Networking

Question 1

What is the default network driver used when you create a container without specifying a network?

Accepted Answer

bridge

Answer

Docker uses the bridge network driver by default when no network is specified at container creation.

Question 2

Which Docker network driver allows containers on different Docker hosts to communicate?

Accepted Answer

overlay

Answer

The overlay network driver enables communication between containers across multiple Docker hosts in a Swarm cluster.

Question 3

What command creates a user-defined bridge network named 'my-network'?

Accepted Answer

docker network create --driver bridge my-network

Answer

The `docker network create --driver bridge my-network` command creates a user-defined bridge network.

Question 4

Which port publishing flag maps host port 8080 to container port 80?

Accepted Answer

-p 8080:80

Answer

The `-p 8080:80` flag maps host port 8080 to container port 80 using the host:container format.

Question 5

What does the `--network host` flag do when running a container?

Accepted Answer

Shares the host's network namespace with the container

Answer

The `--network host` flag removes network isolation between the container and the Docker host.

DCA - Docker Certified Associate Exam Practice Test