What is the output of 'docker ps -a'?

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The command docker ps -a is specifically used to display all containers on a Docker host, regardless of their current state. This includes running containers as well as those that have been stopped or exited. The -a or --all flag signifies that every container should be listed, making it invaluable for developers and system administrators who need to monitor the status of all containers, not just the active ones.

In contrast, the other choices focus on different aspects of Docker management. One option refers to displaying only the running containers, which would be the output of docker ps without the -a flag. Another option mistakenly suggests that the command shows the total count of images—a completely different aspect since it doesn't pertain to containers at all. Lastly, listing active networks is unrelated, as the docker ps -a command is container-specific and does not provide information about networks. By understanding the purpose of the -a flag in the context of container management, it becomes clear why the correct output represents a comprehensive view of all containers present in the Docker environment.

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