305-300 Practice Test 9 — 10 Questions

Question 1

How can you force a refresh of a libvirt storage pool named 'isos'?

Accepted Answer

virsh pool-refresh isos. virsh pool-refresh isos triggers a re-scan of the storage pool.

Answer

virsh refresh-pool isos

Answer

virsh pool-update isos

Answer

virsh pool-reload isos

Question 2

Which TWO of the following are benefits of using the QCOW2 image format?

Accepted Answer

Dynamic allocation (sparse files). Snapshots and dynamic allocation are key benefits of QCOW2.

Answer

Multi-host file locking

Answer

Hardware acceleration

Answer

Native encryption for all filesystems

Question 3

Which TWO of the following commands are used for VM disk image management?

Accepted Answer

qemu-img create. qemu-img info and qemu-img create are standard image management commands.

Answer

qemu-img list

Answer

qemu-img status

Answer

qemu-img format

Question 4

You are debugging a Docker network issue where containers on different hosts cannot communicate. Which network driver is specifically designed to support multi-host overlay networking?

Accepted Answer

overlay. The 'overlay' driver in Docker creates a distributed network among multiple Docker daemon hosts.

Answer

bridge

Answer

macvlan

Answer

ipvlan

Answer

host

Question 5

In the context of virtualization, what does 'ballooning' refer to?

Accepted Answer

Dynamically resizing guest memory. Memory ballooning allows the hypervisor to reclaim unused RAM from a guest VM and reallocate it to other VMs.

Answer

Scaling network bandwidth for a VM

Answer

Increasing the number of virtual CPUs

Answer

Compressing disk images on the fly

Question 6

Which QEMU-KVM feature allows you to save the state of a VM to a file and resume it later?

Accepted Answer

virsh save. The 'virsh save' command creates a state file, which can be restored with 'virsh restore'.

Answer

virsh snapshot

Answer

virsh checkpoint

Answer

virsh suspend

Question 7

What does 'QEMU' stand for?

Accepted Answer

Quick Emulator. Quick Emulator.

Answer

Quantum Emulator

Answer

Quick Execution Machine Utility

Answer

Quality Emulator

Question 8

Which THREE of the following XML elements are used to define a virtual disk in a domain?

Accepted Answer

. , , and are the primary sub-elements of a entry.

Answer

<mount-point path='/'>

Answer

Question 9

When configuring a systemd-nspawn container, what is the effect of the --private-network option?

Accepted Answer

It isolates the container's network from the host. The --private-network flag creates a virtual network namespace for the container, ensuring it cannot access the host's network interfaces.

Answer

It forces the container to use a bridge

Answer

It disables network encryption

Answer

It restricts access to localhost

Answer

It prevents the container from starting

Question 10

Which THREE of the following are components of the Docker architecture?

Accepted Answer

Docker Daemon. Docker client, daemon, and registry are the three core components.

Answer

Docker Kernel

Answer

Docker GUI