21.) Which file system is used by Docker containers?
A) Ext4
B) Btrfs
C) UnionFS
D) NTFS
22.) What is the default restart policy for a container?
A) Always
B) No
C) On-failure
D) Unless-stopped
23.) What is the purpose of the docker exec command?
A) To create a new container
B) To restart a container
C) To remove a container
D) To run a command in a running container
24.) What is the default working directory inside a container?
A) /var
B) /root
C) / (root directory)
D) /home
25.) How do you list all containers, including stopped ones?
A) docker ps
B) docker ps -a
C) docker containers
D) docker list –all
26.) How do you rename a running container?
A) docker rename <old-name> <new-name>
B) docker rename <container-id>
C) docker name <container-id>
D) docker edit-name <container-id>
27.) Which command shows the IP address of a running container?
A) docker ip
B) docker info
C) docker inspect
D) docker ps –ip
28.) What is the default user inside a Docker container?
A) Admin
B) Root
C) Docker
D) System
29.) How do you attach to a running container?
A) docker connect <container-id>
B) docker exec -it <container-id>
C) docker join <container-id>
D) docker attach <container-id>
30.) How do you copy files from a container to the host?
A) docker cp <container-id>:<src-path> <dest-path>
B) docker copy <container-id> <src-path>
D) docker export <src-path> <dest-path>
C) docker save <container-id>
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