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Lpi 305-300: LPIC-3 Exam 305: Virtualization and Containerization is a certification exam that focuses on testing the candidate's knowledge and skills in virtualization and containerization. LPIC-3 Exam 305: Virtualization and Containerization certification exam is designed for IT professionals who are interested in virtualization and containerization technology and want to prove their expertise in this field. 305-300 Exam is intended for those who have already obtained the LPIC-2 certification.
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| Passing Score | 500 / 800 |
| Number of Questions | 60 |
| Duration | 90 mins |
| Exam Code | 305-300 |
NEW QUESTION # 68
Which of the following statements are true about sparse images in the context of virtual machine storage?
(Choose two.)
Answer: A,C
Explanation:
Sparse images are a type of virtual disk images that grow in size as data is written to them, but do not shrink when data is deleted from them. Sparse images may consume an amount of space different from their nominal size, which is the maximum size that the image can grow to. For example, a sparse image with a nominal size of 100 GB may only take up 20 GB of physical storage if only 20 GB of data is written to it. Sparse images allocate backend storage at the first usage of a block, which means that the physical storage is only used when the virtual machine actually writes data to a block. This can save storage space and improve performance, as the image does not need to be pre-allocated or zeroed out.
Sparse images are not automatically shrunk when files within the image are deleted, because the virtual machine does not inform the host system about the freed blocks. To reclaim the unused space, a special tool such as virt-sparsify1 or qemu-img2 must be used to compact the image. Sparse images can be used with both full virtualization and paravirtualization, as the type of virtualization does not affect the format of the disk image. Sparse images are not automatically resized when their maximum capacity is about to be exceeded, because this would require changing the partition table and the filesystem of the image, which is not a trivial task. To resize a sparse image, a tool such as virt-resize3 or qemu-img2 must be used to increase the nominal size and the filesystem size of the image. References: 1 (search for "virt-sparsify"), 2 (search for "qemu- img"), 3 (search for "virt-resize").
NEW QUESTION # 69
What is a container image?
Answer: C
Explanation:
Acontainer imageis astatic, immutable packagethat contains an application along with all its required dependencies, libraries, and configuration files. Containerization documentation defines a container image as a snapshot of an application and its runtime environment, which can be instantiated as a running container.
Container images do not include a full operating system kernel; instead, containers share the host system's kernel. This design makes containers lightweight and fast to deploy compared to traditional virtual machines.
Therefore, the correct answer isC.
NEW QUESTION # 70
In order to use the optiondom0_memto limit the amount of memory assigned to the Xen Domain-0, where must this option be specified?
Answer: B
Explanation:
The option dom0_mem is used to set the initial and maximum memory size of the Domain-0, which is the privileged domain that starts first and manages the unprivileged domains (DomU) in Xen. The option dom0_mem must be specified in the bootloader configuration, such as GRUB or GRUB2, when Xen is booted. This ensures that the Domain-0 kernel can allocate memory for storing memory metadata and network related parameters based on the boot time amount of memory. If the option dom0_mem is not specified in the bootloader configuration, the Domain-0 will use all the available memory on the host system by default, which may cause performance and security issues. References:
* Managing Xen Dom0#s CPU and Memory
* Xen Project Best Practices
* Dom0 Memory - Where It Has Not Gone
NEW QUESTION # 71
Which virsh subcommand is used to change the CD-ROM image file attached to a virtual machine?
Answer:
Explanation:
change-media
Explanation:
In libvirt-based virtualization environments, thevirsh change-mediasubcommand is used to change the media attached to removable devices such asCD-ROM drives. According to libvirt documentation, this command allows administrators to insert or eject ISO images from a running virtual machine without shutting it down.
This functionality is commonly used during operating system installations or software updates. The change- media command supports both live and persistent changes depending on the options used.
Therefore, the correct and documented answer ischange-media.
NEW QUESTION # 72
Which of the following statements are true regarding VirtualBox?
Answer: C
Explanation:
VirtualBox is a hosted hypervisor, which means it runs as an application on top of an existing operating system, not as a special kernel that is booted before the first regular operating system starts1. VirtualBox supports a large number of guest operating systems, including Windows, Linux, Solaris, OS/2, and OpenBSD1. VirtualBox does not require dedicated shared storage, as it can store virtual machine disk images locally on block devices of the virtualization host, or on network shares, or on iSCSI targets1. VirtualBox provides both a graphical user interface (GUI) and command line tools (VBoxManage) to administer virtual machines1. VirtualBox is available for Windows, Linux, macOS, and Solaris hosts1, and does not require the source code of the currently running Linux kernel to be available. References:
* Oracle VM VirtualBox: Features Overview
NEW QUESTION # 73
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