Docker Certified Associate (DCA) Practice Questions: Networking Domain

Docker Certified Associate (DCA) Practice Questions

Master the Networking Domain

Test your knowledge in the Networking domain with these 10 practice questions. Each question is designed to help you prepare for the DCA certification exam with detailed explanations to reinforce your learning.

Question 1

In a Docker Swarm, you need to ensure that a service can only communicate with other services within the same Swarm network and not with external networks. Which network driver should you use?

A) Bridge

B) Overlay

C) None

D) Macvlan

Show Answer & Explanation

Correct Answer: B

Explanation: The Overlay network driver is designed for creating networks that span multiple Docker hosts, allowing services within the same Swarm to communicate securely and privately. The Bridge network is limited to a single host. The None network driver would isolate the service from all networks. The Macvlan driver is used for assigning a MAC address to a container, which is not suitable for this requirement.

Question 2

Which command is used to inspect the details of a Docker network?

A) docker network details

B) docker network inspect

C) docker network show

D) docker network info

Show Answer & Explanation

Correct Answer: B

Explanation: The command 'docker network inspect ' is used to inspect the details of a Docker network. Option A is incorrect because 'docker network details' is not a valid command. Option C is incorrect because 'docker network show' is not a valid command. Option D is incorrect because 'docker network info' is not a valid command.

Question 3

You want to connect a running container to an existing network. Which command should you use?

A) docker network connect

B) docker network join

C) docker network attach

D) docker network add

Show Answer & Explanation

Correct Answer: A

Explanation: The 'docker network connect' command is used to connect a running container to an existing network. Option B is incorrect because 'join' is not a valid Docker command. Option C is incorrect because 'attach' is not used for networks in Docker. Option D is incorrect because 'add' is not a valid subcommand for managing networks.

Question 4

How can you inspect the network settings of a specific container?

A) docker network inspect

B) docker inspect --network

C) docker inspect

D) docker network ls --container

Show Answer & Explanation

Correct Answer: C

Explanation: To inspect the network settings of a specific container, you use 'docker inspect '. This command provides detailed information, including network settings. Option A is incorrect because 'network inspect' is used for networks, not containers. Option B is incorrect because '--network' is not a valid flag for 'docker inspect'. Option D is incorrect because 'network ls' is used to list networks, not inspect containers.

Question 5

Which of the following network drivers is best suited for providing a container with direct access to the host’s network interface?

A) bridge

B) host

C) overlay

D) none

Show Answer & Explanation

Correct Answer: B

Explanation: The 'host' network driver is used to provide a container with direct access to the host’s network interface, effectively removing network isolation. Option A is incorrect because 'bridge' provides network isolation. Option C is incorrect because 'overlay' is used for multi-host communication. Option D is incorrect because 'none' disables networking for the container.

Question 6

You need to inspect the IP address of a running Docker container named 'webapp'. Which command provides this information?

A) docker inspect webapp

B) docker network inspect webapp

C) docker inspect --format '{{.NetworkSettings.IPAddress}}' webapp

D) docker ps --ip webapp

Show Answer & Explanation

Correct Answer: C

Explanation: The command 'docker inspect --format '{{.NetworkSettings.IPAddress}}' webapp' extracts the IP address directly from the container's network settings. Option A provides all details, making it harder to find the IP address. Option B is incorrect because it inspects networks, not containers. Option D is not a valid Docker command.

Question 7

When deploying a web application in Docker, you need to ensure that it is accessible via both HTTP and HTTPS. Which of the following Docker features can help you achieve this without modifying the application itself?

A) Docker Swarm

B) Docker Compose

C) Docker Bridge Network

D) Docker Ingress Network

Show Answer & Explanation

Correct Answer: D

Explanation: The Docker Ingress Network is used in Docker Swarm to manage incoming requests and can be configured to handle both HTTP and HTTPS through a load balancer or reverse proxy. Docker Swarm orchestrates services, Docker Compose is for defining multi-container applications, and Docker Bridge Network is the default network but does not inherently manage HTTP/HTTPS traffic.

Question 8

What is the default network driver used when creating a new Docker container without specifying a network?

A) host

B) none

C) bridge

D) overlay

Show Answer & Explanation

Correct Answer: C

Explanation: The default network driver used by Docker is 'bridge'. Option A, 'host', is not the default and provides no network isolation. Option B, 'none', disables networking entirely. Option D, 'overlay', is used for multi-host networking but is not the default.

Question 9

When using the 'bridge' network driver, what is the default subnet assigned to the network?

A) 172.17.0.0/16

B) 192.168.0.0/16

C) 10.0.0.0/8

D) 172.18.0.0/16

Show Answer & Explanation

Correct Answer: A

Explanation: The default subnet assigned to the 'bridge' network in Docker is 172.17.0.0/16. This is the default network configuration for containers on a single host. Option B is incorrect because 192.168.0.0/16 is not used by default. Option C is incorrect because 10.0.0.0/8 is another common private IP range but not the default for Docker. Option D is incorrect because 172.18.0.0/16 is not the default subnet.

Question 10

Which Docker network driver should you use if you need to connect multiple Docker containers across different Docker hosts?

A) bridge

B) host

C) overlay

D) none

Show Answer & Explanation

Correct Answer: C

Explanation: Option C is correct because the overlay network driver enables communication between containers across different Docker hosts. The bridge driver is used for communication between containers on the same host. The host driver removes network isolation between the container and the Docker host, and the none driver disables networking for the container.

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About DCA Certification

The DCA certification validates your expertise in networking and other critical domains. Our comprehensive practice questions are carefully crafted to mirror the actual exam experience and help you identify knowledge gaps before test day.

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