305-300 RELIABLE TEST SAMPLE - 305-300 NEW REAL TEST

305-300 Reliable Test Sample - 305-300 New Real Test

305-300 Reliable Test Sample - 305-300 New Real Test

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Lpi LPIC-3 Exam 305: Virtualization and Containerization Sample Questions (Q49-Q54):

NEW QUESTION # 49
FILL BLANK
What is the default path to the Docker daemon configuration file on Linux? (Specify the full name of the file,Including path.)

Answer:

Explanation:
/etc/docker/daemon.json
Explanation
The default path to the Docker daemon configuration file on Linux is /etc/docker/daemon.json. This file is a JSON file that contains the settings and options for the Docker daemon, which is the service that runs on the host operating system and manages the containers, images, networks, and other Docker resources. The
/etc/docker/daemon.json file does not exist by default, but it can be created by the user to customize the Docker daemon behavior. The file can also be specified by using the --config-file flag when starting the Docker daemon. The file must be a valid JSON object and follow the syntax and structure of the dockerd reference docs12. References:
* Docker daemon configuration file - Medium3
* Docker daemon configuration overview | Docker Docs4
* docker daemon | Docker Docs5


NEW QUESTION # 50
What is the purpose of capabilities in the context of container virtualization?

  • A. Allow regular users to start containers with elevated permissions.
  • B. Restrict the disk space a container can consume.
  • C. Enable memory deduplication to cache files which exist in multiple containers.
  • D. Map potentially dangerous system calls to an emulation layer provided by the container virtualization.
  • E. Prevent processes from performing actions which might infringe the container.

Answer: E

Explanation:
Explanation
Capabilities are a way of implementing fine-grained access control in Linux. They are a set of flags that define the privileges that a process can have. By default, a process inherits the capabilities of its parent, but some capabilities can be dropped or added by the process itself or by the kernel. In the context of container virtualization, capabilities are used to prevent processes from performing actions that might infringe the container, such as accessing the host's devices, mounting filesystems, changing the system time, or killing other processes. Capabilities allow containers to run with a reduced set of privileges, enhancing the security and isolation of the container environment. For example, Docker uses a default set of capabilities that are granted to the processes running inside a container, and allows users to add or drop capabilities as needed12.
References:
* Capabilities | Docker Documentation1
* Linux Capabilities: Making Them Work in Containers2


NEW QUESTION # 51
Which of the following statements are true regarding VirtualBox?

  • A. It requires dedicated shared storage, as it cannot store virtual machine disk images locally on block devices of the virtualization host.
  • B. It only supports Linux as a guest operating system and cannot run Windows inside a virtual machine.
  • C. It is available for Linux only and requires the source code of the currently running Linux kernel to be available.
  • D. It provides both a graphical user interface and command line tools to administer virtual machines.
  • E. It is a hypervisor designed as a special kernel that is booted before the first regular operating system starts.

Answer: D


NEW QUESTION # 52
Which of the following mechanisms are used by LXC and Docker to create containers? (Choose three.)

  • A. POSIXACLs
  • B. Linux Capabilities
  • C. Kernel Namespaces
  • D. File System Permissions
  • E. Control Groups

Answer: B,C,E


NEW QUESTION # 53
Which of the following are true regarding the CPU of a QEMU virtual machine? (Choose two.)

  • A. QEMU virtual machines support multiple virtual CPUs in order to run SMP systems.
  • B. Each QEMU virtual machine can only have one CPU with one core.
  • C. QEMU uses the concept of virtual CPUs to map the virtual machines to physical CPUs.
  • D. For each QEMU virtual machine, one dedicated physical CPU core must be reserved.
  • E. The CPU architecture of a QEMU virtual machine is independent of the host system's architecture.

Answer: A,E

Explanation:
Explanation
The CPU architecture of a QEMU virtual machine is independent of the host system's architecture. QEMU can emulate many CPU architectures, including x86, ARM, Alpha, and SPARC, regardless of the host system's architecture1. This allows QEMU to run guest operating systems that are not compatible with the host system's hardware. Therefore, option A is correct. QEMU virtual machines support multiple virtual CPUs in order to run SMP systems. QEMU uses the concept of virtual CPUs (vCPUs) to map the virtual machines to physical CPUs. Each vCPU is a thread that runs on a physical CPU core. QEMU allows the user to specify the number of vCPUs and the CPU model for each virtual machine. QEMU can run SMP systems with multiple vCPUs, as well as single-processor systems with one vCPU2. Therefore, option E is also correct. The other options are incorrect because they do not describe the CPU of a QEMU virtual machine. Option B is wrong because QEMU virtual machines can have more than one CPU with more than one core. Option C is wrong because QEMU does not require a dedicated physical CPU core for each virtual machine. QEMU can share the physical CPU cores among multiple virtual machines, depending on the load and the scheduling policy.
Option D is wrong because QEMU does not use the term CPU, but vCPU, to refer to the virtual machines' processors. References:
* QEMU vs VirtualBox: What's the difference? - LinuxConfig.org
* QEMU / KVM CPU model configuration - QEMU documentation
* Introduction - QEMU documentation
* Qemu/KVM Virtual Machines - Proxmox Virtual Environment


NEW QUESTION # 54
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