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| Certification Vendor: | Linux Professional Institute (LPI) |
|---|---|
| Exam Name: | LPIC-3 Exam 305: Virtualization and Containerization |
| Exam Number: | 305-300 |
| Related Certifications: | LPIC-1 LPIC-2 LPIC-3 Mixed Environment |
| Passing Score: | 500 (on a 200–800 scaled score) |
| Exam Format: | Multiple choice, Fill in the blank, Multiple response |
| Available Languages: | English, Japanese, Portuguese (Brazil), German, Spanish |
| Real Exam Qty: | Approximately 60 |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 5 years |
| Exam Price: | Approx. 200 USD (varies by region and tax) |
| Recommended Training: | LPI Official Training Resources Linux Professional Institute Learning Materials |
| Exam Registration: | LPI Official Certification Page LPI Exam Registration |
| Sample Questions: | Lpi 305-300 Sample Questions |
| Exam Way: | Computer-based exam delivered at testing centers or online proctored (depending on region and provider availability) |
| Pre Condition: | LPIC-3 certification requires an active LPIC-2 certification. No prerequisite for this specific exam beyond LPIC-2. |
| Official Syllabus URL: | https://www.lpi.org/our-certifications/lpic-3-305-exam-virtualization-and-containerization/ |
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LPIC-3 시험 305 : 가상화와 컨테이너화는 IT 전문가들이 가상화와 컨테이너화 기술의 전문 지식을 입증하는 뛰어난 기회입니다. 시험에 통과하면 더 나은 직업 기회, 더 높은 수익 가능성 및 산업 전문가로 인정받을 수 있습니다.
LPI 305-300 자격증 시험은 가상화 및 컨테이너화 기술에 대한 전문 지식을 증명하고자 하는 IT 전문가를 대상으로합니다. 이 시험은 가장 포괄적이고 고급 Linux 자격증 중 하나로 간주되는 LPIC-3 자격증 프로그램의 일부입니다. LPIC-3 자격증 프로그램은 세 개의 시험으로 구성되며, 모든 시험을 통과해야 자격증을 획득할 수 있습니다. LPIC-3 시험 305는 가상화 원리, 컨테이너화 개념 및 Linux 환경에서 가상화 및 컨테이너화 기술 배포와 같은 주제를 다룹니다.
질문 # 41
Which of the following statements are true about sparse images in the context of virtual machine storage?
(Choose two.)
정답：A,B
설명：
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").
질문 # 42
Which file in acgroupdirectory contains the list of processes belonging to thiscgroup?
정답：E
설명：
Explanation
The file procs in a cgroup directory contains the list of processes belonging to this cgroup. Each line in the file shows the PID of a process that is a member of the cgroup. A process can be moved to a cgroup by writing its PID into the cgroup's procs file. For example, to move the process with PID 24982 to the cgroup cg1, the following command can be used: echo 24982 > /sys/fs/cgroup/cg1/procs1. The file procs is different from the file tasks, which lists the threads belonging to the cgroup. The file procs can be used to move all threads in a thread group at once, while the file tasks can be used to move individual threads2. References:
* Creating and organizing cgroups cgroup2 - GitHub Pages
* Control Groups - The Linux Kernel documentation
질문 # 43
Which of the following tasks are part of a hypervisor's responsibility? (Choose two.)
정답：B,D
설명：
A hypervisor is a software that creates and runs virtual machines (VMs) by separating the operating system and resources from the physical hardware. One of the main tasks of a hypervisor is to map the resources of VMs to the resources of the host system, such as CPU, memory, disk, and network. This allows the hypervisor to allocate and manage the resources among multiple VMs and ensure that they run efficiently and independently123. Another important task of a hypervisor is to isolate the VMs and prevent unauthorized access to resources of other VMs. This ensures the security and privacy of the VMs and their data, as well as the stability and performance of the host system. The hypervisor can use various techniques to isolate the VMs, such as virtual LANs, firewalls, encryption, and access control145.
The other tasks listed are not part of a hypervisor's responsibility, but rather of the guest operating system or the application running inside the VM. A hypervisor does not create filesystems during the installation of new VMs, as this is done by the installer of the guest operating system6. A hypervisor does not provide host-wide unique PIDs to the processes running inside the VMs, as this is done by the kernel of the guest operating system7. A hypervisor does not manage authentication to network services running inside a VM, as this is done by the network service itself or by a directory service such as LDAP or Active Directory8. References: 1 (search for "What is a hypervisor?"), 2 (search for "How does a hypervisor work?"), 3 (search for "The hypervisor gives each virtual machine the resources that have been allocated"), 4 (search for "Benefits of hypervisors"), 5 (search for "Isolate the virtual machines and prevent unauthorized access"), 6 (search for "Create filesystems during the installation of new virtual machine quest operating systems"), 7 (search for "Provide host-wide unique PIDs to the processes running inside the virtual machines"), 8 (search for "Manage authentication to network services running inside a virtual machine").
질문 # 44
What is Xen's role in paravirtualization?
정답：A
설명：
Inparavirtualization, the guest operating system is aware that it is running in a virtualized environment and is modified to interact efficiently with the hypervisor. According to Xen documentation, Xen was originally designed as aparavirtualization-focused hypervisor, requiringmodified guest operating systemsto achieve better performance.
These modifications allow the guest OS to replace sensitive hardware instructions withhypercalls, reducing the overhead associated with hardware emulation. This results in improved CPU, memory, and I/O performance compared to early full virtualization techniques.
Xen does support fully virtualized (HVM) guests, but that is not its role in paravirtualization. Therefore, option Bcorrectly describes Xen's role.
질문 # 45
Which directory is used bycloud-initto store status information and configuration information retrieved from external sources?
정답：C
설명：
cloud-init uses the /var/lib/cloud/ directory to store status information and configuration information retrieved from external sources, such as the cloud platform's metadata service or user data files. The directory contains subdirectories for different types of data, such as instance, data, handlers, scripts, and sem. The instance subdirectory contains information specific to the current instance, such as the instance ID, the user data, and the cloud-init configuration. The data subdirectory contains information about the data sources that cloud-init detected and used. The handlers subdirectory contains information about the handlers that cloud-init executed.
The scripts subdirectory contains scripts that cloud-init runs at different stages of the boot process, such as per- instance, per-boot, per-once, and vendor. The sem subdirectory contains semaphore files that cloud-init uses to track the execution status of different modules and stages. References:
* Configuring and managing cloud-init for RHEL 8 - Red Hat Customer Portal
* vsphere - what is the linux file location where the cloud-init user ...
질문 # 46
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