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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Full Virtualization | 25% | - QEMU
|
| Topic 2: VM Deployment and Provisioning | 10% | - Cloud Init
|
| Topic 3: Container Virtualization | 25% | - Container Virtualization Concepts
|
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NEW QUESTION # 30
Which statement is true regarding the Linux kernel module that must be loaded in order to use QEMU with hardware virtualization extensions?
Answer: D
Explanation:
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)
NEW QUESTION # 31
What kind of virtualization is implemented by LXC?
Answer: C
Explanation:
LXC implements system containers, which are a type of operating-system-level virtualization. System containers allow running multiple isolated Linux systems on a single Linux control host, using a single Linux kernel. System containers share the same kernel with the host and each other, but have their own file system, libraries, and processes. System containers are different from application containers, which are designed to run a single application or service in an isolated environment. Application containers are usually smaller and more portable than system containers, but also more dependent on the host kernel and libraries. Hardware containers, CPU emulation, and paravirtualization are not related to LXC, as they are different kinds of virtualization methods that involve hardware abstraction, instruction translation, or modification of the guest operating system. References:
* 1: LXC - Wikipedia
* 2: Linux Virtualization : Linux Containers (lxc) - GeeksforGeeks
* 3: Features - Proxmox Virtual Environment
NEW QUESTION # 32
What is oVirt?
Answer: C
Explanation:
oVirt is anopen-source virtualization management platformthat provides a comprehensive infrastructure for managingLinux-based virtualization environments. According to official oVirt and Red Hat documentation, oVirt acts as amanagement layer on top of KVM, offering centralized control over hosts, virtual machines, storage, and networking.
oVirt itself isnot a hypervisor; instead, it relies onKVMas the underlying virtualization technology. It provides both aweb-based management interfaceand REST APIs, enabling administrators to manage large- scale virtualization deployments efficiently. Features include VM lifecycle management, live migration, high availability, storage domain management, and integration with directory services.
Option E describeslibvirt, not oVirt. Options A, C, and D do not match oVirt's documented purpose.
Therefore, the correct answer isB.
NEW QUESTION # 33
Which of the following services can QEMU provide in a user network? (Choose three.)
Answer: A,C
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.
:
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 # 34
Which of the following devices exist by default in an LXC container? (Choose three.)
Answer: B,D,E
Explanation:
Explanation
LXC (Linux Containers) is a lightweight virtualization technology that allows multiple isolated Linux systems (containers) to run on the same host. LXC uses Linux kernel features such as namespaces, cgroups, and AppArmor to create and manage containers. Each container has its own file system, network interfaces, process tree, and resource limits. However, containers share the same kernel and hardware with the host, which makes them more efficient and faster than full virtualization.
By default, an LXC container has a minimal set of devices that are needed for its operation. These devices are created by the LXC library when the container is started, and are removed when the container is stopped. The default devices are:
* /dev/log: This is a Unix domain socket that connects to the syslog daemon on the host. It allows the container to send log messages to the host's system log1.
* /dev/console: This is a character device that provides access to the container's console. It is usually connected to the host's terminal or a file. It allows the container to interact with the user or the host's init system12.
* /dev/urandom: This is a character device that provides an unlimited source of pseudo-random numbers. It is used by various applications and libraries that need randomness, such as cryptography, UUID generation, and hashing13.
The other devices listed in the question do not exist by default in an LXC container. They are either not needed, not allowed, or not supported by the container's namespace or cgroup configuration. These devices are:
* /dev/kmem: This is a character device that provides access to the kernel's virtual memory. It is not needed by the container, as it can access its own memory through the /proc filesystem. It isalso not allowed by the container, as it would expose the host's kernel memory and compromise its security4.
* /dev/root: This is a symbolic link that points to the root device of the system. It is not supported by the container, as it does not have a separate root device from the host. The container's root file system is mounted from a directory, an image file, or a loop device on the host5.
References:
* Linux Containers - LXC - Manpages - lxc.container.conf.5
* Linux Containers - LXC - Getting started
* Random number generation - Wikipedia
* /dev/kmem - Wikipedia
* Linux Containers - LXC - Manpages - lxc.container.conf.5
NEW QUESTION # 35
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