The correct approach is to implement a CI/CD pipeline that runs playbooks against a staging environment with similar devices, and only deploy to production after successful validation. This directly addresses the root cause of the outage—a playbook written for IOS-XE being applied to a classic IOS router—by catching model-specific incompatibilities in a safe, representative staging environment before any production impact. On the Cisco DevNet Associate 200-901 exam, this scenario tests your understanding of CI/CD pipeline staging environment network automation as a core safety mechanism, often appearing in questions about deployment strategies and change management. A common trap is to focus solely on syntax checking or code review, which would not catch hardware-specific command differences. Remember the memory tip: "Stage before you rage"—always validate against identical hardware in staging to avoid production outages.
200-901 Software Development and Design Practice Question
This 200-901 practice question tests your understanding of software development and design. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A large enterprise is migrating to a DevOps model and needs to automate the provisioning of network devices. The team has chosen Ansible for configuration management and is using a Git repository for version control. The network includes Cisco IOS routers, Catalyst switches running IOS-XE, and ASA firewalls. The team has written Ansible playbooks for each device type. The goal is to have a CI/CD pipeline that automatically deploys configuration changes to the production network after the changes are merged into the main branch. However, during a recent deployment, a misconfiguration was pushed to a core router, causing a 10-minute outage. The root cause was that the playbook that was executed was not the correct one for that device model. The team wants to implement a mechanism to prevent similar incidents. Which approach should the team adopt?
Implement a CI/CD pipeline that runs playbooks against a staging environment with similar devices, and only deploy to production after successful validation
Correct: Automated testing in staging catches misconfigurations.
B
Require all changes to be approved by a change advisory board before merging
Why wrong: Incorrect: Manual approval does not prevent execution of wrong playbook.
C
Require two-person peer review for all playbook changes
Why wrong: Incorrect: Peer review may not catch all errors.
D
Use a pre-commit hook that checks the playbook syntax and device compatibility
Why wrong: Incorrect: Pre-commit hooks cannot test actual device behavior.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement a CI/CD pipeline that runs playbooks against a staging environment with similar devices, and only deploy to production after successful validation
Option A is correct because a staging environment with similar devices allows the team to validate playbooks against representative hardware before production deployment. This catches model-specific incompatibilities (e.g., a playbook written for IOS-XE being applied to a classic IOS router) without risking production outages. The CI/CD pipeline can run the same playbooks in staging, verify the resulting device state, and only promote changes to production after successful validation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Implement a CI/CD pipeline that runs playbooks against a staging environment with similar devices, and only deploy to production after successful validation
Why this is correct
Correct: Automated testing in staging catches misconfigurations.
Related concept
Read the scenario before looking for a memorised answer.
✗
Require all changes to be approved by a change advisory board before merging
Why it's wrong here
Incorrect: Manual approval does not prevent execution of wrong playbook.
✗
Require two-person peer review for all playbook changes
Why it's wrong here
Incorrect: Peer review may not catch all errors.
✗
Use a pre-commit hook that checks the playbook syntax and device compatibility
Why it's wrong here
Incorrect: Pre-commit hooks cannot test actual device behavior.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between static validation (syntax checks, peer review) and dynamic validation (staging environment testing), and the trap here is assuming that code review or pre-commit hooks alone can prevent runtime device-model mismatches.
Detailed technical explanation
How to think about this question
Ansible uses the `ansible_network_os` variable to select the appropriate connection plugin and module set for a device (e.g., `cisco.ios.ios` for IOS, `cisco.ios.iosxr` for IOS-XR). If a playbook targets `ios` but runs against an IOS-XE device, commands may fail silently or produce unexpected results because IOS-XE uses a different CLI structure for certain features. A staging environment with identical hardware and software versions allows the team to test the full playbook execution, including idempotency checks and post-deployment validation, before production rollout.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Software Development and Design — This question tests Software Development and Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Implement a CI/CD pipeline that runs playbooks against a staging environment with similar devices, and only deploy to production after successful validation — Option A is correct because a staging environment with similar devices allows the team to validate playbooks against representative hardware before production deployment. This catches model-specific incompatibilities (e.g., a playbook written for IOS-XE being applied to a classic IOS router) without risking production outages. The CI/CD pipeline can run the same playbooks in staging, verify the resulting device state, and only promote changes to production after successful validation.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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