LCA Virtualization & Container Management 2

Question 1

Which command displays all running and stopped Docker containers?

Accepted Answer

docker ps -a

Answer

The '-a' flag with 'docker ps' lists all containers regardless of state, including stopped ones.

Question 2

In KVM virtualization, what file format natively supports snapshots, encryption, and compression?

Accepted Answer

qcow2

Answer

QCOW2 (QEMU Copy-On-Write v2) is KVM's native format supporting snapshots, encryption, and thin provisioning.

Question 3

What is the purpose of the 'docker network create' command?

Accepted Answer

Create an isolated network for container communication

Answer

'docker network create' defines a new network that containers can join to communicate with each other in isolation.

Question 4

Which libvirt tool is used to manage virtual networks from the command line?

Accepted Answer

virsh

Answer

virsh is the command-line interface for libvirt and can manage networks, domains, storage, and more.

Question 5

A Dockerfile instruction 'COPY . /app' is run during which phase?

Accepted Answer

Image build

Answer

COPY and other Dockerfile instructions execute during 'docker build', creating image layers.

(LCA) Certified Linux Administrator Practice Test