Free LPIC-3: Virtualization and Containerization – Exam 305, version 3.0 Exam 305-300 Exam Practice Test

What is the purpose of capabilities in the context of container virtualization?

• Map potentially dangerous system calls to an emulation layer provided by the container virtualization.
• Restrict the disk space a container can consume.
• Enable memory deduplication to cache files which exist in multiple containers.
• Allow regular users to start containers with elevated permissions.
• Prevent processes from performing actions which might infringe the container.

What is the default provider of Vagrant?

• lxc
• hyperv
• virtualbox
• vmware_workstation
• docker

Which of the following statements about the command lxc-checkpoint is correct?

• It creates a clone of a container.
• It doubles the memory consumption of the container.
• It only works on stopped containers.
• It writes the status of the container to a file.
• It creates a container image based on an existing container.

Which of the following network interface types are valid in an LXD container configuration? (Choose three.)

• ipsec
• macvlan
• bridged
• physical
• wifi

What is the purpose of a .dockerignore file?

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

What is the purpose of the command vagrant init?

• It executes a provisioning tool in a running box.
• It starts a Vagrant box.
• It creates a Vagrant configuration file.
• It installs Vagrant on a Linux host.
• It downloads a Vagrant box.

Which directory is used by cloud-init to store status information and configuration information retrieved from external sources?

• /var/lib/cloud/
• /etc/cloud-init/cache/
• /proc/sys/cloud/
• /tmp/.cloud/
• /opt/cloud/var/

FILL BLANKWhich subcommand of virsh opens the XML configuration of a virtual network in an editor in order to make changes to that configuration? (Specify ONLY the subcommand without any parameters.)

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

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

Which of the following statements are true about sparse images in the context of virtual machine storage? (Choose two.)

• Sparse images are automatically shrunk when files within the image are deleted.
• Sparse images may consume an amount of space different from their nominal size.
• Sparse images can only be used in conjunction with paravirtualization.
• Sparse images allocate backend storage at the first usage of a block.
• Sparse images are automatically resized when their maximum capacity is about to be exceeded.