Docker Quiz, Docker MCQ (Multiple Choice Questions)

1 .

Who introduced docker?

A)

Linus Torvalds, Mark Zuckerberg and Brendan Eich

B)

Kamel Founadi, Solomon Hykes, and Sebastien Pahl

C)

Brendan Eich, Sebastien Pahl and Greg Duffy

D)

Mike Cagney, Suhail Doshi and Chris Wanstrath

Correct Answer : Kamel Founadi, Solomon Hykes, and Sebastien Pahl

Explanation : Docker Inc. was founded by Kamel Founadi, Solomon Hykes, and Sebastien Pahl during the Y Combinator Summer 2010 startup incubator group and launched in 2011. The startup was also one of the 12 startups in Founder's Den first cohort.

2 .

When was Docker Initially released?

A)

March 20, 2003

B)

March 20, 2007

C)

March 20, 2010

D)

March 20, 2013

Correct Answer : March 20, 2013

Explanation :

Docker debuted to the public in Santa Clara at PyCon in 2013. It was released as open-source in March 2013. At the time, it used LXC as its default execution environment.

One year later, with the release of version 0.9, Docker replaced LXC with its own component, libcontainer, which was written in the Go programming language.

In 2017, Docker created the Moby project for open research and development.

3 .

The markup language used to write Docker configuration files is:

A)

XML

B)

HTML

C)

YAML

D)

JSON

Correct Answer : YAML

Explanation : YAML stands for "YAML Ain't Markup Language." It is the structured, yet flexible syntax used to define how to configure a Docker image.

4 .

Which programming language was used to write Docker?

A)

C

B)

C++

C)

Go

D)

Java

Correct Answer : Go

Explanation :

Go, also known as Golang, was the language used to code the implementation of the Docker container.

Go is a compiled programming language that was first released in 2009. As you may have guessed by the two letters in the name, it was created by a group of developers at Google.

5 .

Following Docker command:

docker build -t my_user/repo_name:1.0â€‹

is used to:

A)

Build an image

B)

Access a running container

C)

Activate default VM machine

D)

Commit changes done in a Docker image

Correct Answer : Build an image

6 .

How do you map a host port to the container port?

A)

docker run -i : imagename

B)

docker run -p 5000:5000 flask_app:1.0

C)

docker run --expose 5000:5000 flask_app:1.0

D)

None of the above

Correct Answer : docker run -p 5000:5000 flask_app:1.0

Explanation : -p is a short flag for --port option to map host port to container port.

7 .

Which of these features is NOT provided by VMs?

A)

Scalabilty

B)

Better resource pooling

C)

Application portability guaranteed

D)

All of the options are features provided by

Correct Answer : Application portability guaranteed

8 .

What is Docker?

A)

Docker is an open platform based on Linux containers for developing, shipping, and running applications.

B)

Docker is a closed platform based on Linux containers for developing, designing and deploying.

C)

Docker is an open platform based on Windows containers for developing, shipping, and running applications.

D)

None of the above

Correct Answer : Docker is an open platform based on Linux containers for developing, shipping, and running applications.

9 .

Docker containers share the same OS

A)

True

B)

False

C)

Can not say

D)

--

Correct Answer : True

10 .

Which sentence describes better Docker?

A)

Build once, run twice

B)

Build once, run everywhere

C)

Easy to run, is much more fun

D)

All of the above

Correct Answer : Build once, run everywhere

11 .

Following Docker command:

docker commit -m "My first update" container_ID user_name/repository_name

is used to :

A)

Build an image

B)

Access a running container

C)

Activate default VM machine

D)

Commit changes done in a Docker image

Correct Answer : Commit changes done in a Docker image

12 .

Following Docker command:

docker push user_name/repository_name

is used to:

A)

Build an image

B)

Activate default VM machine

C)

Commit changes done in a Docker image.

D)

Push changes done in a docker image into Docker Hub.

Correct Answer : Push changes done in a docker image into Docker Hub.

13 .

Containers running on a single machine all share the same operating system kernel, so they start instantly and make more efficient use of RAM.

A)

True

B)

False

C)

Can not say

D)

--

Correct Answer : True

14 .

Which of the following is not a container-based alternative to Docker?

A)

Kubernetes

B)

Canonical's LXD

C)

CoreOS' rkt

D)

Windows Server Containers

Correct Answer : CoreOS' rkt

Explanation : Kubernetes is an orchestration tool that manages Docker deployments, but it is not a Docker alternative. LXD, rkt and the Windows Server Containers are container implementation technologies that compete with Docker.

15 .

What happens if you attempt to perform a Docker build based on an image that has not been previously referenced on your machine?

A)

Docker will pull the image from GitHub.

B)

Docker will return a 404: file not found message.

C)

Docker will return a 408: image not found message.

D)

Docker will pull the image from Docker Hub.

Correct Answer : Docker will pull the image from Docker Hub.

Explanation : Docker will look at the local image repository when a container image is referenced in a Dockerfile. If one is not found on the host, Docker will search for an image with the same name and version number on Docker Hub.

16 .

Information on how to build a Docker image is written in a file named:

A)

dockerimage

B)

Jenkinsfile

C)

Dockerfile

D)

docker-compose

Correct Answer : Dockerfile

Explanation : The Docker naming convention recommends that users save information on how to build a container image in a file named Dockerfile.

17 .

Each virtual machine includes the application, the necessary binaries and libraries, and an entire guest operating system - All of which may be tens of GBs in size.

A)

True

B)

False

C)

Can not say

D)

--

Correct Answer : True

18 .

________is a cloud-hosted service from Docker that provides registry capabilities for public and private content.

A)

Docker Cloud

B)

Docker Hub

C)

Docker Swarm

D)

Docker Compose

Correct Answer : Docker Hub

19 .

________is a tool for defining and running multi-container Docker applications.

A)

Docker Cloud

B)

Docker Hub

C)

Docker Swarn

D)

Docker Compose

Correct Answer : Docker Compose

20 .

Docker main features are :

A)

Fast, Scalable, Reliable

B)

Lightweight, Standard, Secure

C)

Lightweight, Scalable, Fast

D)

Lightweight, Sociable, Secure

Correct Answer : Lightweight, Standard, Secure

21 .

Docker basics are :

A)

Image, Container, VM, App Manager

B)

Image, Container, Engine, App Manager

C)

Image, Container, Engine, Registry, Control Plane

D)

None of the above

Correct Answer : Image, Container, Engine, Registry, Control Plane

22 .

VMs dynamically allocate RAM, CPU and other resources

A)

True

B)

False

C)

Can not say

D)

--

Correct Answer : False

23 .

________is native clustering for Docker. It turns a pool of Docker hosts into a single, virtual Docker host.

A)

Docker Swarm

B)

Docker Cloud

C)

Docker Hub

D)

Docker Compose

Correct Answer : Docker Swarm

24 .

________is the enterprise-grade cluster management solution from Docker. It manages your whole cluster from a single place.

A)

Docker Hub

B)

Docker Swarm

C)

Docker Compose

D)

Docker Universal Control Plane

Correct Answer : Docker Universal Control Plane

25 .

Docker host's IP address by default is 192.168.99.100

A)

True

B)

False

C)

Can not say

D)

--

Correct Answer : True

Explanation :

You don’t, they’re different. (“localhost” always resolves to 127.0.0.1 and it’s a very magical IP address.)

If you’re seeing an IP address of 192.168.99.100 you’re probably using Docker Toolbox or Docker Machine, which is running Docker on a Linux VM, and that’s the default IP address of that VM. If you’re using one of these options to run Docker then you have to use the $(docker-machine ip) address, usually 192.168.99.100. If you really want it to be “localhost” then you need to switch to the desktop-based Docker for Mac, or Docker for Windows, or just running Docker directly on your Linux host, as appropriate.

Source : Docker

26 .

Which of the following statements is most correct in Docker?

A)

Docker allows you to run and build images.

B)

Docker allows you to run and build containers.

C)

Docker allows you to run containers and build images.

D)

Docker allows you to run images and build containers.

Correct Answer : Docker allows you to run containers and build images.

Explanation : When a process based on a Docker image is started, it is referred to as a container. In contrast with containers, Docker images are built. And it is the container, which is based on the image, that is run.

27 .

The Docker logo is :

A)

a butler

B)

a whale

C)

a sailboat

D)

an Octocat

Correct Answer : a whale

Explanation :

This may seem like a silly question, but when you find out that Kubernetes refers to a group of Docker containers as a "pod," some of the cloud-native naming patterns start to make sense.

A butler is the Jenkins logo. The sailboat goes with Jakarta EE. And the Octocat is the GitHub logo.

28 .

_______is a hosted service that provides a Registry with build and testing facilities for Dockerized application images, tools to help you set up and manage your host infrastructure, and deployment features to help you automate deploying your images to your infrastructure.

A)

Docker Hub

B)

Docker Cloud

C)

Docker Compose

D)

Docker Universal Control Plane

Correct Answer : Docker Cloud

29 .

________is an open-source project built to simplify and streamline using Docker on a Mac or Windows. This tool automates the Docker installation and setup process and provides an intuitive graphical user interface (GUI) for running Docker containers.

A)

Docker Compose

B)

Docker Cloud

C)

Docker Universal Control Plane

D)

Docker Kitematic

Correct Answer : Docker Kitematic

30 .

You can install Docker Engine directly to servers you have on cloud providers. The providers supported are :

A)

Digital Ocean

B)

Microsoft Azure

C)

Amazon Web Services (AWS)

D)

All of the above

Correct Answer : All of the above

31 .

Which of these statements about containers is false

A)

Containers are an improvement compared with VMs

B)

A container image is a lightweight, stand-alone, executable package of a piece of software

C)

A Container includes everything it needs to run: code, runtime, system tools, system libraries, settings.

D)

All of them are right

Correct Answer : All of them are right

32 .

Docker containers are based on open standard_____________________.

A)

Allowing containers to run on all major Linux distributions only

B)

Allowing containers to run on all Microsoft operating systems only

C)

Allowing containers to run on all major Linux distributions and Microsoft operating systems

D)

All of the above

Correct Answer : Allowing containers to run on all major Linux distributions and Microsoft operating systems

33 .

Following Docker command:

eval $(docker-machine env default)

is used to:

A)

Activate default VM machine

B)

Build an image

C)

Access a running container

D)

Commit changes done in a Docker image

Correct Answer : Activate default VM machine

34 .

On Docker Hub, you get ten private repositories for free with your Docker Hub user account. If you need more accounts, you can upgrade your Docker Hub plan.

A)

True

B)

False

C)

Can not say

D)

--

Correct Answer : False

35 .

At the OS level, the goal of independent application execution and failure isolation is achieved through the use of:

A)

namespaces

B)

Kubernetes

C)

control groups

D)

security groups

Correct Answer : namespaces

Explanation :

Namespaces make the isolation of the process that runs a Docker container possible.

Control groups are what make it possible to limit the amount of CPU time and memory allocated to a given container.

Security groups are typically associated with AWS configurations, and Kubernetes is a container orchestration tool.

36 .

The history of application containerization is intimately tied to which OS?

A)

MacOS

B)

Linux

C)

Windows

D)

Android

Correct Answer : Linux

Explanation : Linux added two features to its kernel, namely control groups and namespaces, that made it possible to run software in isolated containers. These two changes made the container revolution possible.

37 .

A Docker container is often described as an improvement over what other technology?

A)

DevOps

B)

microservices

C)

cloud computing

D)

virtual machines

Correct Answer : virtual machines

Explanation :

Docker containers are often compared to VMs, as both provide the ability to deploy and run multiple, independent applications on the same physical machine.

Docker containers are less resource intensive, as they provide process-level virtualization as opposed to full OS virtualization provided by a VM, which is one of the reasons the industry has shifted toward containers.