Cisco Cisco Certified DevNet Professional 300-910 Questions & Answers

• Question 1:

  When static routes are added to a router in a network using a CI/CD pipeline, an Ansible playbook is used to make these changes. Which steps must be added to the pipeline to validate that the changes have the intended effect on the traffic flow?

  A. Add a step to run the debug ip routing command before the change, and add a step after the change to issue the no debug ip routing command.

  B. Add a step to capture the routing table before the change, and add a step after the change to capture it again. Calculate the difference between the two for review.

  C. Add a step to ping a host on each of the static routes before the change, and a step after to repeat the same check. Calculate the difference between the two checks for review.

  D. Add a step to run the same playbook again with the debug option enabled and use grep on the log output to ensure that the commands are not applied again.

  Correct Answer: B

• Question 2:

  Refer to the exhibit.

  

  A developer needs to scale the existing pods within the worked nodes. Which object should be edited to achieve this goal?

  A. ReplicaSet

  B. PriorityClass

  C. Deployment

  D. Pod

  Correct Answer: A

• Question 3:

  Refer to the exhibit.

  

  The exhibit shows the output of an Ansible task that prints the contents of the show_ip_int_brief variable that was registered in a different task in the playbook. Which expression is used to print the output of the command without its header row?

  A. show_ip_int_brief[`stdout_lines'][0]

  B. show_ip_int_brief[`stdout_lines'][1:]

  C. show_ip_int_brief[`stdout_lines'][0][1:]

  D. show_ip_int_brief[`stdout_lines']

  Correct Answer: C

  show_ip_int_brief["~stdout_lines'][0][1:]

  stdout_lines - nested list,

  [0], first element of above nested list (extract of all header + interfaces, coma separated for individual elements),

  [1:] - 2nd, 3rd, 4th line of the above sub-list.

• Question 4:

  Which two statements about Infrastructure as Code are true? (Choose two.)

  A. Test-driven development practices make use of Infrastructure as Code.

  B. Infrastructure as Code refers to automated testing libraries.

  C. DevOps builds upon Infrastructure as Code.

  D. Infrastructure as Code is based on practices from software development.

  E. Infrastructure as Code must use the same programming language as the application.

  Correct Answer: CD

  (IaC) is a practice that allows for the automation of infrastructure configuration and deployment, allowing DevOps teams to deploy and manage infrastructure with the same release pipelines and versioning as source code [1]. IaC is based on practices from software development, and promotes the use of automation and repeatable processes to ensure consistency of deployments.

• Question 5:

  When DevOps practices are integrated into an existing organization, which two characteristics are positive indicators of DevOps maturity? (Choose two.)

  A. mean time between success

  B. mean time to recover

  C. cone testing

  D. change lead time

  E. age of codebase

  Correct Answer: BD

  Change lead time is the amount of time it takes for a proposed change to go from the idea phase to being fully deployed in production. This metric can be used to measure the speed and efficiency with which changes are implemented, which is often indicative of an organization's DevOps maturity. Mean time to recover (MTTR) is the average amount of time it takes to restore a service or application to its working state when an issue arises. MTTR is an important metric for measuring the resilience of an organization's infrastructure, and is another indicator of DevOps maturity. (Source: Cisco Implementing DevOps Solutions and Practices using Cisco Platforms (DEVOPS) Study Manual Chapter 1, Understanding DevOps)

• Question 6:

  Which two characteristics of a build tool that is used in an automated build pipeline? (Choose two.)

  A. It runs unit tests against code that is committed.

  B. It builds your software on the production environment.

  C. It builds your software when changes are committed.

  D. It builds your software every 500 milliseconds.

  E. It must have a plug-in for Puppet and Maven.

  Correct Answer: BC

  The two characteristics of a build tool that is used in an automated build pipeline are A) it builds your software when changes are committed and B) it runs unit tests against code that is committed. Automated build tools are used to detect changes to source code and then build the software that resulted from the change. Additionally, these tools can be configured to run unit tests against the code to ensure that it works as expected.

• Question 7:

  Refer to the exhibit.

  

  What is the user doing with Drone in this automated test?

  A. testing Alpine Linux versus Ubuntu Linux

  B. testing a PostgreSQL DB against multiple architectures

  C. testing only the amd64 architecture

  D. testing PostgreSQL deployment in an Alpine Linux VM

  Correct Answer: D

• Question 8:

  An interface on a router as a Layer 3 link has been configured to another device by updating an Ansible playbook that is executed via a CI/CD pipeline. The Ansible playbook was written to push the configuration change using the ios_config module.

  Which automated test validates that the interface is functioning as it should?

  A. Add a pipeline step that runs the playbook a second type. If it does not modify the device on the second run, then the interface is correctly configured.

  B. Automated testing is already built in because the playbook execution is successful only after Ansible validates that it applied the change.

  C. Add a pipeline step that captures and parses the packet flow for the interface.

  D. Add a pipeline step that captures and parses the show ip interface output so that the operational state can be referenced.

  Correct Answer: D

  Adding a pipeline step that captures and parses the show ip interface output so that the operational state can be referenced is the best way to validate that the interface is functioning as it should. This can be done by using the ioscommand module to capture the output of the show ip interface command, and then using the iosparse module to parse the output and extract the relevant interface information. The ios_parse module allows you to validate the interface state, to ensure that it is up and running as expected.

  Reference:

  Cisco Implementing DevOps Solutions and Practices using Cisco Platforms (DEVOPS) Study Manual, Chapter 6, Section 6.3.6.

• Question 9:

  ConfigMap keys have been mapped to different file names using the volumes.configMap.items field. What is the result if a wrong ConfigMap key is specified?

  A. The default path is not used.

  B. The volume is not created.

  C. The volume is created.

  D. The volume is created with errors.

  Correct Answer: B

  If a wrong ConfigMap key is specified, the volume will not be created since the ConfigMap key must match the name of the item specified in the volumes.configMap.items field.

• Question 10:

  What are two benefits of Infrastructure as Code? (Choose two.)

  A. It enables continuous integration.

  B. It allows for management control.

  C. It ensures consistency.

  D. It improves application monitoring.

  E. It reduces risk.

  Correct Answer: CE