350-501 Architecture Practice Question
Which statement about the commit/rollback configuration model in IOS XR is true?
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
✓
If a commit fails, the system automatically rolls back to the last committed configuration
IOS XR uses a two-phase commit: the user commits, and if successful, the configuration is applied; otherwise, it rolls back. There is no need for explicit rollback commands.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Rollback requires manual deletion of uncommitted changes
Why it's wrong here
The commit/rollback is automatic.
- ✗
Configuration is applied to all cards simultaneously without validation
Why it's wrong here
Validation occurs before commit.
- ✓
If a commit fails, the system automatically rolls back to the last committed configuration
Why this is correct
The commit model ensures atomicity: on failure, changes are discarded.
- ✗
Changes take effect immediately without a commit command
Why it's wrong here
IOS XR requires an explicit commit to activate changes.
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