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Lpi 305-300 Exam Syllabus Topics:

Section	Weight	Objectives
Full Virtualization	25%	- Virtualization Concepts and Theory - QEMU - Xen - Libvirt Virtual Machine Management - Virtual Machine Disk Image Management
Container Virtualization	25%	- Docker - LXC - Container Virtualization Concepts - Container Orchestration Platforms
VM Deployment and Provisioning	12%	- Vagrant - Packer - Cloud Management Tools - cloud-init

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Lpi LPIC-3 Exam 305: Virtualization and Containerization Sample Questions (Q82-Q87):

NEW QUESTION # 82
What is the purpose of a .dockerignore file?

A. It specifies files that Docker does not submit to the Docker daemon when building a Docker image
B. It must be placed in the top level directory of volumes that Docker should never attach automatically to a container
C. It exists in the root file system of containers that should ignore volumes and ports provided by Docker.
D. It specifies which parts of a Dockerfile should be ignored when building a Docker image.
E. It lists files existing in a Docker image which should be excluded when building a derivative image.

Answer: A

Explanation:
The purpose of a .dockerignore file is to specify files that Docker does not submit to the Docker daemon when building a Docker image. A .dockerignore file is a text file that contains a list of files or directories that should be excluded from the build context, which is the set of files and folders that are available for use in a Dockerfile. By using a .dockerignore file, you can avoid sending files or directories that are large, contain sensitive information, or are irrelevant to the Docker image to the daemon, which can improve the efficiency and security of the build process. The other options are incorrect because they do not describe the function of a .dockerignore file. Option A is wrong because a .dockerignore file does not affect the files existing in a Docker image, but only the files sent to the daemon during the build. Option C is wrong because a .
dockerignore file does not exist in the root file system of containers, but in the same directory as the Dockerfile. Option D is wrong because a .dockerignore file does not affect the volumes that Docker attaches to a container, but only the files included in the build context. Option E is wrong because a .dockerignore file does not affect the parts of a Dockerfile that are executed, but only the files available for use in a Dockerfile.
References:
* What are .dockerignore files, and why you should use them?
* Dockerfile reference | Docker Docs
* How to use .dockerignore and its importance - Shisho Cloud

NEW QUESTION # 83
What is the purpose ofcloud-init?

A. Replace common Linux inic systems, such as systemd or SysV init.
B. Assign an laaS instance to a specific computing node within a cloud.
C. Prepare the generic image of an laaS instance to fit a specific instance's configuration.
D. Orchestrate the creation and start of multiple related laaS instances.
E. Standardize the configuration of infrastructure services, such as load balancers or virtual firewalls in a cloud.

Answer: C

Explanation:
Cloud-init is a tool that processes configurations and runs through five stages during the initial boot of Linux VMs in a cloud. It allows users to customize a Linux VM as it boots for the first time, by applying user data to the instance. User data can include scripts, commands, packages, files, users, groups, SSH keys, and more.
Cloud-init can also interact with various cloud platforms and services, such as Azure, AWS, OpenStack, and others. The purpose of cloud-init is to prepare the generic image of an laaS instance to fit a specific instance's configuration, such as hostname, network, security, and application settings. References:
* Cloud-init - The standard for customising cloud instances
* Understanding cloud-init - Azure Virtual Machines
* Tutorial - Customize a Linux VM with cloud-init in Azure - Azure Virtual Machines

NEW QUESTION # 84
What is the purpose of the commandvagrantinit?

A. It executes a provisioning tool in a running box.
B. It downloads a Vagrant box.
C. It creates a Vagrant configuration file.
D. It starts a Vagrant box.
E. It installs Vagrant on a Linux host.

Answer: C

NEW QUESTION # 85
Which of the following are true regarding the CPU of a QEMU virtual machine? (Choose two.)

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

Answer: C,E

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 # 86
Which of the following services can QEMU provide in a user network? (Choose three.)

A. DHCP
B. AppleTalk
C. BGP
D. TFTP
E. CIFS

Answer: A,D

Explanation:
Explanation
QEMU can provide some network services in a user network, which is a mode of networking that does not require any administrator privilege to run. The user network uses the SLIRP TCP/IP emulator to create a virtual NAT'ted subnet, with a DHCP server started by QEMU that gives out IP addresses to the guest machines and puts the host on 10.0.2.21. QEMU can also provide a TFTP server in the user network, which can be used to boot the guest machines from a network image. The TFTP server can be configured with the
-tftp option2. QEMU does not provide BGP, CIFS, or AppleTalk services in the user network. BGP is a routing protocol that is used to exchange routing information between autonomous systems on the Internet3. CIFS is a file-sharing protocol that is used to access files and printers on a network4. AppleTalk is a deprecated network protocol suite that was used by Apple devices5. These services require more advanced networking features than the user network can offer, such as bridging, routing, or tunneling.
References:
* Documentation/Networking - QEMU
* QEMU/Networking - Wikibooks, open books for an open world
* Border Gateway Protocol - Wikipedia
* Common Internet File System - Wikipedia
* AppleTalk - Wikipedia

NEW QUESTION # 87
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