350-501 Architecture Practice Question
An SP uses Cisco ASR 9000 routers with IOS XR. Which statement correctly describes the commit/rollback configuration model in IOS XR?
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
✓
Changes are staged in a candidate configuration and applied only after 'commit'; rollback to a previous commit is possible.
IOS XR requires a 'commit' to apply changes; it supports rollback to previous committed configurations, allowing safe changes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Only 'commit replace' is supported; rollback requires manual re-entry.
Why it's wrong here
Rollback is supported via 'rollback' commands.
- ✓
Changes are staged in a candidate configuration and applied only after 'commit'; rollback to a previous commit is possible.
Why this is correct
This is the commit/rollback model.
- ✗
The router automatically commits changes every 10 minutes.
Why it's wrong here
No automatic commit exists.
- ✗
Changes take effect immediately without commit; rollback is not supported.
Why it's wrong here
IOS XR uses a two-phase commit model.
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