JNCIA-DevOps Python And PyEZ Practice Question
When loading configuration changes via PyEZ using cu.load(format='xml', action='update'), what is the precise impact of the 'update' action compared to 'merge' or 'override'?
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
✓
It merges configuration changes with the existing candidate configuration, modifying or adding specified nodes while preserving unreferenced nodes.
The 'update' action merges configuration elements based on matching keys or identifiers, allowing precise modification of existing hierarchical statements without replacing entire blocks.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
It overwrites the entire candidate configuration, discarding all prior uncommitted changes.
Why it's wrong here
This behavior describes 'override', whereas 'update' is incremental.
- ✗
It completely replaces the running configuration with the provided payload.
Why it's wrong here
Replacing the configuration corresponds to the 'override' action.
- ✓
It merges configuration changes with the existing candidate configuration, modifying or adding specified nodes while preserving unreferenced nodes.
Why this is correct
The update action applies incremental updates matched by identifiers.
- ✗
It deletes the matching hierarchy nodes entirely before inserting new ones.
Why it's wrong here
That describes a replace or delete action depending on XML tags, not the general update load action.
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Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Juniper Networks exam blueprint
This JNCIA-DevOps practice question is part of Courseiva's free Juniper Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the JNCIA-DevOps exam.