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| Section | Weight | Objectives |
|---|---|---|
| VM Deployment and Provisioning | 12% | - Vagrant - cloud-init - Packer - Cloud Management Tools |
| Container Virtualization | 25% | - LXC - Container Virtualization Concepts - Container Orchestration Platforms - Docker |
| Full Virtualization | 25% | - QEMU - Virtualization Concepts and Theory - Libvirt Virtual Machine Management - Virtual Machine Disk Image Management - Xen |
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問題 #53
What is true aboutcontainerd?
答案：E
解題說明：
Explanation
Containerd is an industry-standard container runtime that uses Runc (a low-level container runtime) by default, but can be configured to use others as well1. Containerd manages the complete container lifecycle of its host system, from image transfer and storage to containerexecution and supervision1. It supports the standards established by the Open Container Initiative (OCI)1. Containerd does not require the Docker engine and Docker CLI to be installed, as it can be used independently or with other container platforms2. Containerd is not a text file format, nor does it run in each Docker container or provide DHCP client functionality. Containerd is not the initial process run at the start of any Docker container, as that is the role of the container runtime, such as Runc3. References: 1 (search for "containerd"), 2 (search for "Containerd is an open source"), 3 (search for "It uses rune to start containers").
問題 #54
Which of the following commands lists all differences between the disk images vm1-snap.img and vm1.img?
答案：A
問題 #55
Which disk image formats are commonly used in Linux-based virtualization environments? (Select all that apply)
答案：A,B,C,D
解題說明：
Linux-based virtualization environments support a wide range of disk image formats to ensure compatibility with multiple hypervisors and cloud platforms. According to virtualization documentation,RAW, VMDK, QCOW2, and VHDare all commonly used formats.
RAWimages are simple, unstructured disk files that offer maximum performance due to minimal overhead.
QCOW2(QEMU Copy-On-Write version 2) is the most widely used format in KVM environments because it supports advanced features such as snapshots, thin provisioning, compression, and encryption.VMDKis the native disk format for VMware products but is frequently used in Linux environments for interoperability and migration purposes.VHDis commonly associated with Microsoft Hyper-V but is also supported by QEMU and cloud platforms.
Virtualization notes emphasize that modern Linux virtualization tools like QEMU and libvirt are designed to work across multiple disk formats. This flexibility enables administrators to migrate workloads between different hypervisors and cloud providers without rebuilding virtual machines.
Therefore, all listed disk image formats are valid and commonly supported in Linux-based virtualization environments.
問題 #56
Which of the following commands executes a command in a running LXC container?
答案：E
解題說明：
Explanation
The command lxc-attach is used to execute a command in a running LXC container. It allows the user to start a process inside the container and attach to its standard input, output, and error streams1. For example, the command lxc-attach -n mycontainer -- ls -lh /home will list all the files and directories in the /home directory of the container named mycontainer1. The other options are not valid LXC commands. The command lxc-batch does not exist. The command lxc-run is an alias for lxc-start, which is used to start a container, not to execute a command in it2. The command lxc-enter is also an alias for lxc-attach, but it is deprecated and should not be used3. The command lxc-eval is also not a valid LXC command. References:
* 1: Executing a command inside a running LXC - Unix & Linux Stack Exchange.
* 2: lxc-start: start a container. - SysTutorials.
* 3: lxc-attach: start a process inside a running container. - SysTutorials.
問題 #57
Which statement is true regarding the Linux kernel module that must be loaded in order to use QEMU with hardware virtualization extensions?
答案：D
解題說明：
The Linux kernel module that must be loaded in order to use QEMU with hardware virtualization extensions is KVM (Kernel-based Virtual Machine). KVM is a full virtualization solution that allows a user space program (such as QEMU) to utilize the hardware virtualization features of various processors (such as Intel VT or AMD-V). KVM consists of a loadable kernel module, kvm.ko, that provides the core virtualization infrastructure and a processor specific module, kvm-intel.ko or kvm-amd.ko. KVM must be loaded into the kernel of the host system in order to use the virtualization extensions of the host system's CPU. This enables QEMU to run multiple virtual machines with unmodified Linux or Windows images, each with private virtualized hardware. KVM is integrated with QEMU, so there is no need to load it into the kernel of each virtual machine or the first virtual machine. KVM also does not require paravirtualization, which is a technique that modifies the guest operating system to communicate directly with the hypervisor, bypassing the emulation layer. References:
* Features/KVM - QEMU
* Kernel-based Virtual Machine
* KVM virtualization on Red Hat Enterprise Linux 8 (2023)
問題 #58
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305-300最新題庫資源: https://www.vcesoft.com/305-300-pdf.html
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