EX188 Red Hat Certified Specialist in Containers PDF Questions

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2. The safer , easier way to help you pass any IT exams. 1.Which instruction is used to define the base image in a Containerfile? A. FROM B. BASE C. INIT D. IMAGE Answer: A Explanation: The FROM instruction sets the base image for the build process. It is mandatory in every Containerfile to establish the starting point for subsequent instructions. 2.What is the primary purpose of the RUN instruction in a Containerfile? A. To copy files from the host B. To execute commands during the image build process C. To specify default commands for the container D. To define the base image Answer: B Explanation: The RUN instruction allows the execution of commands to install dependencies, configure software, or make other changes to the image during the build process. 3.Which instruction would you use to copy files from a local directory into the container? A. ADD B. COPY C. RUN D. INCLUDE Answer: B Explanation: The COPY instruction is used to copy files and directories from the build context into the image. It is preferred over ADD for copying local files. 4.What is the key difference between the ADD and COPY instructions in a Containerfile? A. ADD can fetch remote URLs, COPY cannot B. COPY decompresses archives, ADD does not C. ADD requires a build context, COPY does not D. COPY and ADD are identical Answer: A Explanation: The ADD instruction can copy local files and fetch files from remote URLs, while COPY is limited to copying files from the local build context. 5.Which instruction sets the working directory inside the container? A. WORKDIR B. DIRECTORY C. PATH 2 / 5

3. The safer , easier way to help you pass any IT exams. D. LOCATE Answer: A Explanation: The WORKDIR instruction sets the working directory for instructions that follow. It simplifies path management in the Containerfile. 6.When using the USER instruction in a Containerfile, what does it define? A. The default user to run container processes B. The ownership of files in the container C. The user permissions during image build D. The user for network connections Answer: A Explanation: The USER instruction specifies the user under which the container will run, enhancing security by avoiding root privileges. 7.Which instruction is recommended for defining environment variables in a Containerfile? A. ENV B. VAR C. EXPORT D. CONFIG Answer: A Explanation: The ENV instruction defines environment variables that are used during the build process and runtime, ensuring consistent configurations. 8.What is the purpose of the CMD instruction in a Containerfile? A. To set a default command for container execution B. To define build-time commands C. To set environment variables D. To expose ports Answer: A Explanation: The CMD instruction specifies the default command to run when the container starts. It can be overridden during runtime. 9.Which instruction allows you to pass parameters to a container's entry point? A. ENTRYPOINT B. CMD C. RUN D. CONFIG Answer: A Explanation: The ENTRYPOINT instruction is used to define the main executable and allows passing parameters, 3 / 5

4. The safer , easier way to help you pass any IT exams. providing flexibility for container behavior. 10.How does exposing ports in a Containerfile affect container networking? A. It allows the container to listen for traffic on specified ports B. It opens host system ports C. It restricts access to internal services D. It is mandatory for network connectivity Answer: A Explanation: The EXPOSE instruction informs container runtime of the ports that the application listens on, enabling service discovery but not opening the ports automatically. 11.What is the best practice for managing container volumes? A. Use named volumes for better lifecycle management B. Always use host mounts C. Avoid using volumes D. Rely on temporary filesystems Answer: A Explanation: Named volumes are managed by the container runtime, ensuring data persistence and better lifecycle control compared to host mounts. 12.Which method ensures secure mounting of a host directory as a container volume? A. Use read-only mode unless writes are required B. Avoid using SELinux policies C. Grant full permissions to all users D. Enable privileged mode Answer: A Explanation: Mounting directories in read-only mode minimizes the risk of unwanted modifications, enhancing security and compliance with least privilege principles. 13.What is the purpose of cleaning up unused volumes after container deletion? A. To save disk space B. To enhance container performance C. To remove metadata conflicts D. To improve runtime security Answer: A Explanation: Cleaning up unused volumes reduces disk space usage, prevents clutter, and avoids potential conflicts in volume management. 14.Which instruction ensures a specific user executes container processes? A. USER 4 / 5

5. The safer , easier way to help you pass any IT exams. B. CMD C. RUN D. ENV Answer: A Explanation: The USER instruction specifies the non-root user for running processes, enhancing container security and reducing risks. 15.Why should ENTRYPOINT be preferred over CMD for executable containers? A. It ensures the container always runs as intended B. It allows overriding the entry point easily C. It supports multiple commands at runtime D. It has no security implications Answer: A Explanation: ENTRYPOINT makes containers more predictable by ensuring the defined executable runs regardless of runtime arguments. 16.Which instruction allows you to add compressed archives directly into an image? A. ADD B. COPY C. RUN D. EXTRACT Answer: A Explanation: The ADD instruction can decompress archives like .tar.gz into the container filesystem, offering additional functionality over COPY. 17.What should you consider when exposing ports in a Containerfile? A. Use dynamic port assignment for flexibility B. Match the application’s listening ports C. Avoid exposing ports in production D. Always expose multiple ports Answer: B Explanation: The EXPOSE instruction should align with the application’s listening ports to ensure correct networking and service availability. 5 / 5