This 350-401 practice question tests your understanding of automation. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 DevOps team is implementing a CI/CD pipeline that automates network configuration changes. Which design principle is most important to ensure that a failed deployment does not cause prolonged outages?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ensure the automation framework supports rollback to a known good state
Option B is correct because in a CI/CD pipeline for network automation, the ability to roll back to a known good state is the most critical design principle for minimizing downtime. If a deployment fails (e.g., a misapplied ACL or BGP configuration), the automation framework must be able to revert the network device to its previous stable configuration—often by reapplying a saved startup config or using a tool like Ansible's `network_backup` role or Cisco NSO's rollback mechanism. Without this, a failed deployment could leave the network in a broken state until manual intervention, causing prolonged outages.
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.
✗
Use a single source of truth for all configurations
Why it's wrong here
A single source of truth ensures consistency but does not handle failures.
✓
Ensure the automation framework supports rollback to a known good state
Why this is correct
Rollback is critical to quickly restore service after a failed deployment.
Related concept
Read the scenario before looking for a memorised answer.
✗
Implement idempotent configuration scripts
Why it's wrong here
Idempotency prevents repeated changes but does not recover from a failure.
✗
Run the deployment in a lab environment first
Why it's wrong here
Lab testing reduces risk but does not guarantee zero downtime in production.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between 'preventing errors' (idempotency, single source of truth) and 'recovering from errors' (rollback), and the trap here is that candidates confuse idempotency with rollback, thinking that re-running a script will fix a failure, when in fact idempotency only ensures consistency, not recovery from a broken state.
Detailed technical explanation
How to think about this question
Under the hood, a robust rollback mechanism often relies on transactional configuration models, such as Cisco's `configure replace` command or the `candidate` datastore in NETCONF/YANG (RFC 6241). For example, in a CI/CD pipeline using Ansible, the `cisco.ios.ios_config` module can back up the running config before applying changes, and if the deployment fails a health check (e.g., BGP neighbor flapping), the pipeline can trigger a `configure replace` to restore the backup. In real-world scenarios, a failed deployment might cause a routing blackhole; without rollback, the team would need to manually SSH into each device, increasing MTTR from minutes to hours.
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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
Automation — This question tests Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Ensure the automation framework supports rollback to a known good state — Option B is correct because in a CI/CD pipeline for network automation, the ability to roll back to a known good state is the most critical design principle for minimizing downtime. If a deployment fails (e.g., a misapplied ACL or BGP configuration), the automation framework must be able to revert the network device to its previous stable configuration—often by reapplying a saved startup config or using a tool like Ansible's `network_backup` role or Cisco NSO's rollback mechanism. Without this, a failed deployment could leave the network in a broken state until manual intervention, causing prolonged outages.
What should I do if I get this 350-401 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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Question Discussion
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