Question 1

What statement is true regarding the Swarm service created by the following command? docker service create --name myweb --network webnet --mode global nginx

Options :

A : It runs exactly one time in the Swarm and cannot be scaled.

B : It runs exactly once on each node in a Swarm.

C : It runs on one node by default and can be scaled to an arbitrary number of replicas.

D : It runs on all nodes which provide the network webnet.

E : It runs only on those nodes which support the network type global.

Answer: C

Question 2

Which statements are true regarding databases during the deployment of a new release of a service using canary deployment? (Choose two correct answers.)

Options :

A : Changes to the database schema can take long and reduce the database performance.

B : Traffic to the database will significantly increase because of the additional service instance.

C : The database schema must be compatible to all running versions of a service.

D : The database is locked while its content is copied to the canary database.

E : Canary deployments require two synchronized instances of each database.

Answer: A,B

Question 3

An Ansible variable file contains the following content:

myapp:

option1: one

Which of the following strings can be used to reference the defined variable? (Choose two

correct answers).

Options :

A : myapp(option1);

B : option1@myapp

C : myapp[‘option1’]

D : myapp.option1

E : myapp{{option1}}

Answer: A

Question 4

What is tested by unit tests?

Options :

A : The syntactical correctness of the source code of a software component.

B : The formal validity of a service’s external REST API.

C : The integration of multiple component of the same software.

D : The correctness of a specific function of a software component.

E : The throughput, load capacity and latency of a service.

Answer: D

Question 5

The following command is issued on two docker nodes:

docker network create --driver bridge isolated_nw

Afterwards, one container is started at each node with the parameter --

network=isolated_nw. It turns out that the containers can not interact with each other. What

must be done in order to allow the containers to interact with each other? (Choose two

correct answers.)

Options :

A : Use a host network instead of a bridged network.

B : Add the option --inter-container to the docker network create command.

C : Start the containers on the same node.

D : Change the --network parameter of docker create to --network=isolated_nw,nofence.

E : Use an overlay network instead of a bridged network.

Answer: C,D

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