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| Section | Weight | Objectives |
|---|---|---|
| Container Virtualization | 25% | - LXC - Docker - Container Virtualization Concepts - Container Orchestration Platforms |
| Full Virtualization | 25% | - Libvirt Virtual Machine Management - QEMU - Virtualization Concepts and Theory - Virtual Machine Disk Image Management - Xen |
| VM Deployment and Provisioning | 12% | - cloud-init - Packer - Cloud Management Tools - Vagrant |
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NEW QUESTION # 16
Which of the following devices exist by default in an LXC container? (Choose three.)
Answer: A,D,E
NEW QUESTION # 17
Which of the following restrictions is true when using KVM with User Networking?
Answer: C
Explanation:
KVM User Networking (SLIRP) provides basic network connectivity without requiring root privileges or bridge configuration. According to QEMU/KVM documentation, one key limitation is thatICMP (ping) is not supported.
User Networking allows outbound TCP/UDP connections but restricts inbound connections and ICMP traffic.
Therefore,Cis the correct answer.
NEW QUESTION # 18
What is the purpose of capabilities in the context of container virtualization?
Answer: C
Explanation:
Capabilities are a way of implementing fine-grained access control in Linux. They are a set of flags that define the privileges that a process can have. By default, a process inherits the capabilities of its parent, but some capabilities can be dropped or added by the process itself or by the kernel. In the context of container virtualization, capabilities are used to prevent processes from performing actions that might infringe the container, such as accessing the host's devices, mounting filesystems, changing the system time, or killing other processes. Capabilities allow containers to run with a reduced set of privileges, enhancing the security and isolation of the container environment. For example, Docker uses a default set of capabilities that are granted to the processes running inside a container, and allows users to add or drop capabilities as needed12.
References:
* Capabilities | Docker Documentation1
* Linux Capabilities: Making Them Work in Containers2
NEW QUESTION # 19
What does LXC stand for?
Answer: B
Explanation:
LXCstands forLinux Containers, a lightweight virtualization technology that enables multiple isolated Linux systems (containers) to run on a single Linux host. Virtualization and containerization documentation describes LXC as acontainer-based virtualization solutionthat uses Linux kernel features such as namespaces, control groups (cgroups), and capabilitiesto provide process isolation without requiring a full hypervisor.
Unlike traditional virtual machines, LXC containers share the host kernel, which significantly reduces overhead and improves performance. Each container behaves like an independent Linux system with its own process tree, network interfaces, and filesystem, while still relying on the host kernel for execution.
LXC is often referred to as"system containers", as it allows running full Linux distributions inside containers, unlike application-focused containers such as Docker. It serves as the foundation for higher-level container platforms, includingLXD, which provides enhanced management features and APIs.
The other options are incorrect because they do not align with established Linux container terminology.
Official Linux container documentation consistently defines LXC asLinux Containers, making optionBthe correct answer.
NEW QUESTION # 20
Which of the following commands moves the libvirt domainweb1from the current host system to the host systemhost2?
Answer: D
Explanation:
Explanation
The correct command to move the libvirt domain web1 from the current host system to the host system host2 is virsh migrate web1 qemu+ssh://host2/system. This command uses the virsh migrate command, which initiates the live migration of a domain to another host1. The first argument is the name of the domain to migrate, which in this case is web1. The second argument is the destination URI, which specifies the connection to the remote host and the hypervisor to use2. In this case, the destination URI is qemu+ssh://host2/system, which means to use the QEMU driver and connect to host2 via SSH, and use the system instance of libvirtd3. The other options are incorrect because they either use invalid commands or arguments, such as node-update, pool-add, patch, or cp, or they do not specify the destination URI correctly.
References:
https://balamuruhans.github.io/2019/01/09/kvm-migration-with-libvirt.html
http://libvirt.org/migration.html
NEW QUESTION # 21
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