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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: VM Deployment and Provisioning | 12% | - cloud-init - Vagrant - Packer - Cloud Management Tools |
| Topic 2: Full Virtualization | 25% | - QEMU - Libvirt Virtual Machine Management - Xen - Virtual Machine Disk Image Management - Virtualization Concepts and Theory |
| Topic 3: Container Virtualization | 25% | - LXC - Docker - Container Virtualization Concepts - Container Orchestration Platforms |
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NEW QUESTION # 63
Which of the following components are essential in Docker architecture? (Select all that apply)
Answer: A,B,D
NEW QUESTION # 64
Which command in the KVM monitor restores a snapshot?
Answer:
Explanation:
loadvm
Explanation:
In KVM and QEMU-based virtualization environments, the QEMU monitor provides an interactive interface for managing virtual machine runtime operations. According to KVM documentation, the command used to restore a previously saved snapshot within the monitor is loadvm.
Snapshots capture the state of a virtual machine at a specific point in time, including CPU state, memory, and disk state (depending on configuration). The loadvm command allows administrators to revert a virtual machine back to that saved state, which is especially useful for testing, debugging, and recovery scenarios.
This command is typically used in conjunction with the savevm command, which creates snapshots. The functionality is supported primarily with disk formats such as QCOW2, which allow snapshot capabilities.
Therefore, the correct and documented command is loadvm.
NEW QUESTION # 65
Which of the following services can QEMU provide in a user network? (Choose three.)
Answer: B,C,E
NEW QUESTION # 66
Which of the following tasks are part of a hypervisor's responsibility? (Choose two.)
Answer: C,E
NEW QUESTION # 67
Which of the following statements are true about sparse images in the context of virtual machine storage?
(Choose two.)
Answer: A,E
Explanation:
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 # 68
......
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