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| Section | Weight | Objectives |
|---|---|---|
| Full Virtualization | 25% | - Virtualization Concepts and Theory
|
| Container Virtualization | 25% | - Docker
|
| VM Deployment and Provisioning | 10% | - Vagrant
|
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NEW QUESTION # 76
Which of the following commands deletes all volumes which are not associated with a container?
Answer: B
Explanation:
Explanation
The command that deletes all volumes which are not associated with a container is docker volume prune. This command removes all unused local volumes, which are those that are not referenced by any containers. By default, it only removes anonymous volumes, which are those that are not given a specific name when they are created. To remove both unused anonymous and named volumes, the --all or -a flag can be added to the command. The command will prompt for confirmation before deleting the volumes, unless the --force or -f flag is used to bypass the prompt. The command will also show the total reclaimed space after deleting the volumes12.
The other commands listed in the question are not valid or do not have the same functionality as docker volume prune. They are either made up, misspelled, or have a different purpose. These commands are:
* docker volume cleanup: This command does not exist in Docker. There is no cleanup subcommand for docker volume.
* docker volume orphan -d: This command does not exist in Docker. There is no orphan subcommand for docker volume, and the -d flag is not a valid option for any docker volume command.
* docker volume vacuum: This command does not exist in Docker. There is no vacuum subcommand for docker volume.
* docker volume garbage-collect: This command does not exist in Docker. There is no garbage-collect subcommand for docker volume.
References:
* docker volume prune | Docker Docs
* How to Remove all Docker Volumes - YallaLabs.
NEW QUESTION # 77
Which utility is used to create and manage virtual machine disk images in Linux?
Answer: C
Explanation:
In Linux-based virtualization environments,qemu-imgis the standard utility used to create, convert, inspect, and manage virtual machine disk images. Virtualization and containerization documentation clearly identifies qemu-img as a core component of theQEMU/KVM virtualization stack. It supports multiple disk image formats such as RAW, QCOW2, VMDK, and VHD, making it highly versatile across different hypervisors and platforms.
The qemu-img tool allows administrators to perform critical disk operations, including creating new disk images, resizing existing images, converting between formats, and checking disk integrity. For example, it is commonly used to createQCOW2 images, which support advanced features like copy-on-write, snapshots, and compression.
Other options listed are incorrect becauseDisk Utilityis a general-purpose storage management tool, VirtualBox Manageris specific to Oracle VirtualBox, andLibvirt Disk Manageris not a recognized standalone utility. Libvirt relies on qemu-img internally for disk image handling.
Official virtualization notes consistently reference qemu-img as theprimary disk image management toolin Linux virtualization environments, especially when working with KVM and libvirt-based systems.
NEW QUESTION # 78
Which of the following statements is true regarding networking with libvirt?
Answer: E
Explanation:
Explanation
Libvirt supports creating and managing various types of virtual networks that can be used to connect virtual machines to each other or to the external network. One of the common types of virtual networks is the NAT-based network, which uses network address translation (NAT) to allow virtual machines to access the outside world through the host's network interface. By default, libvirt creates a NAT-based network called
'default' when it is installed and started. This network appears as a standard Linux bridge device on the host system, named virbr0. The bridge device has an IP address of 192.168.122.1/24 and acts as a gateway and a DHCP server for the virtual machines connected to it. The bridge device also has iptables rules to forward and masquerade the traffic from and to the virtual machines. The virtual machines connected to the 'default' network have their own IP addresses in the 192.168.122.0/24 range and their own MAC addresses generated by libvirt. The virtual machines can communicate with each other, with the host, and with the external network through the bridge device and the NAT mechanism12.
The other statements in the question are false regarding networking with libvirt. Libvirt's network functionality is not limited to connecting virtual machines to a physical network interface of the host system. Libvirt can also create isolated networks that do not have any connection to the outside world, or routed networks that use static routes to connect virtual machines to the external network without NAT3.
Libvirt does not assign the same MAC address to all virtual machines and isolate their network interfaces at the link layer. Libvirt assigns a unique MAC address to each virtual machine and allows them to communicate with each other at the network layer4. Libvirt does not require a dedicated network interface that may not be used by the host system. Libvirt can share the host's network interface with the virtual machines using NAT or bridging, or it can pass a physical network interface to a virtual machine exclusively using PCI passthrough5.
Libvirt does not support exactly one virtual network and connect all virtual machines to it. Libvirt supports creating and managing multiple virtual networks with different names and configurations, and connecting virtual machines to different networks according to their needs6. References:
* libvirt: Virtual Networking
* libvirt: NAT forwarding (aka "virtual networks")
* libvirt: Routed network
* libvirt: MAC address
* libvirt: PCI passthrough of host network devices
* [libvirt: Network XML format]
NEW QUESTION # 79
Which of the following statements is true regarding the following output ofxl list:
Answer: C
Explanation:
The output of xl list shows the state of the domains. The domain with ID 6, Ubuntu, has a state of "b-". This means that the domain is blocked, which means it is idle or waiting for I/O.
https://xenbits.xen.org/docs/unstable/man/xl.1.html
NEW QUESTION # 80
Which of the following tools is not typically used for VM provisioning and image creation?
Answer: B
Explanation:
VM provisioning and image creation tools are used tobuild, configure, and initialize virtual machine images. According to virtualization documentation,Packeris specifically designed for automated image creation,Vagrantis used for provisioning reproducible development environments, andcloud-initis used to configure instances at first boot.
Kubernetes, however, is acontainer orchestration platform, not a VM provisioning or image creation tool.
It manages containerized workloads after infrastructure has already been provisioned.
Documentation clearly separatesinfrastructure provisioning toolsfromapplication orchestration platforms
. As such, Kubernetes is not typically used for VM provisioning or image creation.
Therefore, the correct answer isA.
NEW QUESTION # 81
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