Free Docker DCA Exam Questions

Question 1

What behavior is expected when a service is created with the following command: 'docker service create -- publish 8000:80 nginx'

A : All nodes in the cluster will listen on port 8080 and forward to port 80 in the container.

B : Only a single node in the cluster will listen on port 8080 and forward to port 80 in the container.

C : All nodes in the cluster will listen on port 80 and forward to port 8080 in the container.

D : Only a single node in the cluster will listen on port 80 and forward to port 8080 in the container.

Answer: A

Question 2

The Kubernetes yaml shown below describes a clusterIP service.Is this a correct statement about how this service routes requests? Solution: Traffic sent to the IP of this service on port 80 will be routed to port 8080 in a random pod with the label app: nginx.

A : Yes

B : No

Answer: B

Question 3

The following Docker Compose file is deployed as a stack:Is this statement correct about this health check definition? Solution: Health checks test for app health ten seconds apart. Three failed health checks transition the container into “unhealthy” status.

A : Yes

B : No

Answer: B

Question 4

The Kubernetes yaml shown below describes a clusterIP service.Is this a correct statement about how this service routes requests? Solution: Traffic sent to the IP of this service on port 80 will be routed to port 8080 in a random pod with the label app: nginx.

A : Yes

B : No

Answer: B

Question 5

Does this describe the role of Control Groups (cgroups) when used with a Docker container? Solution: role-based access control to clustered resources

A : Yes

B : No

Answer: B