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| Section | Weight | Objectives |
|---|---|---|
| VM Deployment and Provisioning | 12% | - Cloud Management Tools - Packer - Vagrant - cloud-init |
| Full Virtualization | 25% | - Virtualization Concepts and Theory - Xen - Virtual Machine Disk Image Management - Libvirt Virtual Machine Management - QEMU |
| Container Virtualization | 25% | - Container Virtualization Concepts - LXC - Docker - Container Orchestration Platforms |
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NEW QUESTION # 12
Which of the following statements are true regarding VirtualBox?
Answer: E
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 # 13
Which of the following statements are true regarding resource management for full virtualization? (Choose two.)
Answer: C,D
Explanation:
Resource management for full virtualization is the process of allocating and controlling the physical resources of the host system to the virtual machines running on it. The hypervisor is the software layer that performs this task, by providing each virtual machine with a virtual hardware of a defined capacity that limits the resources of the virtual machine. For example, the hypervisor can specify how many virtual CPUs, how much memory, and how much disk space each virtual machine can use. The hypervisor can also enforce resource isolation and prioritization among the virtual machines, to ensure that they do not interfere with each other or consume more resources than they are allowed to. The hypervisor cannot provide fine-grained limits to internal elements of the guest operating system, such as the number of processes, because the hypervisor does not have access to the internal state of the guest operating system. The guest operating system is responsible for managing its own resources within the virtual hardware provided by the hypervisor. For example, the guest operating system can create an arbitrary amount of network sockets, as long as it does not exceed the network bandwidth allocated by the hypervisor. Full virtualization can pose limits to virtual machines, and does not always assign the host system's resources in a first-come-first-serve manner. The hypervisor can use various resource management techniques, such as reservation, limit, share, weight, and quota, to allocate and control the resources of the virtual machines. The hypervisor can also use resource scheduling algorithms, such as round-robin, fair-share, or priority-based, to distribute the resources among the virtual machines according to their needs and preferences. All processes created within the virtual machines are not transparently and equally scheduled in the host system for CPU and I/O usage. The hypervisor can use different scheduling policies, such as proportional-share, co-scheduling, or gang scheduling, to schedule the virtual CPUs of the virtual machines on the physical CPUs of the host system. The hypervisor can also use different I/O scheduling algorithms, such as deadline, anticipatory, or completely fair queuing, to schedule the I/O requests of the virtual machines on the physical I/O devices of the host system. The hypervisor can also use different resource accounting and monitoring mechanisms, such as cgroups, perf, or sar, to measure and report the resource consumption and performance of the virtual machines. References:
* Oracle VM VirtualBox: Features Overview
* Resource Management as an Enabling Technology for Virtualization - Oracle
* Introduction to virtualization and resource management in IaaS | Cloud Native Computing Foundation
NEW QUESTION # 14
What is the primary advantage of container virtualization compared to traditional virtualization?
Answer: A
Explanation:
The primary advantage of container virtualization isfaster startup times. Containers share the host OS kernel and do not require booting a full guest operating system, allowing them to start in seconds or milliseconds.
While containers also use fewer resources, the most commonly cited primary benefit in documentation is rapid startup and scalability, makingBthe correct answer.
NEW QUESTION # 15
How does cloud-init enhance the customization of cloud instances?
Answer: D
Explanation:
Cloud-init enhances cloud instance customization by allowing users to provideuser data and scriptsthat are executed during thefirst bootof an instance. According to cloud-init documentation, these scripts and configuration files enable tasks such as installing packages, configuring services, setting hostnames, managing users, and injecting SSH keys.
Cloud-init does not automatically configure every aspect of an instance, nor does it provide a graphical interface. It also does not directly integrate with containerization tools. Its strength lies inautomation and repeatability, making instance initialization consistent across environments.
Thus, the correct answer isB.
NEW QUESTION # 16
FILL BLANK
What LXC command lists containers sorted by their CPU, block I/O or memory consumption? (Specify ONLY the command without any path or parameters.)
Answer:
Explanation:
lxc-top
Explanation
LXD supports the following network interface types for containers: macvlan, bridged, physical, sriov, and ovn1. Macvlan creates a virtual interface on the host that is connected to the same network as the parent interface2. Bridged connects the container to a network bridge that acts as a virtual switch3. Physical attaches the container to a physical network interface on the host2. Ipsec and wifi are not valid network interface types for LXD containers. References:
* 1: Bridge network - Canonical LXD documentation
* 2: How to create a network - Canonical LXD documentation
* 4: LXD containers and networking with static IP - Super User
NEW QUESTION # 17
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