DCA Online Practice Questions and Answers

Correct Answer: C

Correct Answer: A

Correct Answer: A

Using kubectl describe deployment api displays the events table for this object. The kubectl describe command shows detailed information about a resource, including its status and events. This command can be used to troubleshoot a deployment that is not working as expected

Correct Answer: DE

Correct Answer: B

Correct Answer: B

Traffic sent to the IP of any pod with the label app: nginx on port 8080 will be forwarded to port 80 in that pod is not a correct statement about how this service routes requests. A clusterIP service does not route requests based on the pod IP, but on the service IP. A clusterIP service also does not forward requests from one port on the pod IP to another port on the same pod IP, but from one port on the service IP to another port on the pod IP. Therefore, this statement is incorrect and does not describe how this service routes requests. References: https://kubernetes.io/docs/concepts/services- networking/service/#defining-a-service, https://kubernetes.io/docs/concepts/services- networking/service/#virtual-ips-andservice-proxies

Correct Answer: B

This command will not ensure that overlay traffic between service tasks is encrypted, because it uses an invalid option for enabling encryption. According to the official documentation, there is no such option as --secure for the docker network create command. The correct option to use is -o encrypted=true.

Correct Answer: A

Network is a type of Linux kernel namespace that provides container isolation. A network namespace provides isolation of network devices, stacks, ports, etc. Each network namespace has its own network devices, IP addresses, IP routing tables, /proc/net directory, port numbers, etc. Docker uses network namespaces to give each container its own virtual network interface and IP address.

Correct Answer: A

This command will mount the host's `/data' directory to the ubuntu container in read-only mode, because it uses the correct syntax and options for mounting a host directory as a data volume and making it read-only. According to the official documentation, this is an example of using a read-only volume.

Correct Answer: A