Docker MCQs with answers Page - 41

Dear candidates you will find MCQ questions of Docker here. Learn these questions and prepare yourself for coming examinations and interviews. You can check the right answer of any question by clicking on any option or by clicking view answer button.
Share your questions by clicking Add Question

Q. What is the function of a network alias in Docker?

  • (A) Assigns IP addresses
  • (B) Provides DNS-based names
  • (C) Acts as a backup route
  • (D) Encrypts traffic
💬 Discuss
✅ Correct Answer: (B) Provides DNS-based names
Explanation: A network alias allows referencing containers by alternative DNS names.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:14 am in Docker

Q. What does the `--internal` flag do when creating a Docker network?

  • (A) Makes the network encrypted
  • (B) Allows only internal container communication
  • (C) Enables port forwarding
  • (D) Disables Docker DNS
💬 Discuss
✅ Correct Answer: (B) Allows only internal container communication
Explanation: An `--internal` network doesn't allow external access to containers attached to it.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:14 am in Docker

Q. Can a user-defined bridge network have custom subnet and gateway?

  • (A) No
  • (B) Yes, but only on Windows
  • (C) Yes
  • (D) Only in Swarm
💬 Discuss
✅ Correct Answer: (C) Yes
Explanation: You can specify custom subnets and gateways while creating user-defined bridge networks.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:14 am in Docker

Q. Which Docker command removes a network?

  • (A) docker network rm
  • (B) docker rm network
  • (C) docker network delete
  • (D) docker remove network
💬 Discuss
✅ Correct Answer: (A) docker network rm
Explanation: `docker network rm` deletes a Docker network.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:14 am in Docker

Q. In a Docker network, which service provides DNS-based container name resolution?

  • (A) etcd
  • (B) Consul
  • (C) embedded DNS server
  • (D) Swarm Agent
💬 Discuss
✅ Correct Answer: (C) embedded DNS server
Explanation: Docker includes an embedded DNS server for service discovery and name resolution.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:14 am in Docker

Q. What does Docker use for internal DNS resolution?

  • (A) /etc/hosts only
  • (B) External DNS only
  • (C) Built-in DNS server
  • (D) Swarm DNS
💬 Discuss
✅ Correct Answer: (C) Built-in DNS server
Explanation: Docker uses an embedded DNS server to resolve container and service names.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:14 am in Docker

Q. What happens if you remove a network with active containers connected?

  • (A) It removes containers too
  • (B) It throws an error
  • (C) It silently fails
  • (D) It disconnects containers automatically
💬 Discuss
✅ Correct Answer: (B) It throws an error
Explanation: Docker doesn't allow you to remove a network if containers are still connected.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:14 am in Docker

Q. Which Docker network mode allows containers to share the host’s network stack?

  • (A) bridge
  • (B) overlay
  • (C) host
  • (D) none
💬 Discuss
✅ Correct Answer: (C) host
Explanation: The 'host' network mode allows containers to use the host’s networking directly.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:16 am in Docker

Q. Which network driver should be used for multi-host container communication?

  • (A) host
  • (B) bridge
  • (C) overlay
  • (D) none
💬 Discuss
✅ Correct Answer: (C) overlay
Explanation: The overlay driver is designed for multi-host networking in Docker Swarm.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:16 am in Docker

Q. What is the function of the 'none' network driver?

  • (A) Disables networking
  • (B) Enables full network access
  • (C) Shares network with another container
  • (D) Creates an isolated overlay network
💬 Discuss
✅ Correct Answer: (A) Disables networking
Explanation: The 'none' driver disables all networking for the container.

Published by Mr. Dubey ⭐ 111.54K Points at 24-Jul-2025 07:16 am in Docker

Programming Categories

📱 Download Our App

Learn MCQs on the go with our easy-to-use Android app

Get it on Google Play