350-501 Architecture Practice Question
An SP is using Cisco ASR 9000 routers with IOS XR. They need to apply a configuration change and ensure that if the change causes issues, it can be easily reverted. Which IOS XR feature supports this?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Commit/rollback
IOS XR uses a commit/rollback configuration model. Changes are staged in a candidate configuration and committed; if issues arise, rollback to a previous commit is possible.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configuration replace
Why it's wrong here
Replace is a feature but not the primary rollback mechanism.
- ✗
Synchronization to standby
Why it's wrong here
That is for high availability, not configuration rollback.
- ✓
Commit/rollback
Why this is correct
Correct. The commit/rollback model allows safe configuration changes.
- ✗
Archive and restore
Why it's wrong here
Archive/restore is manual; commit/rollback is integrated.
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