N10-009 Practice Question: A backout plan outlines steps to revert a change.
This N10-009 practice question tests your understanding of network operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: a backout plan outlines steps to revert a change.. 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 network engineer plans to change the routing protocol configuration on a core router that will affect connectivity to all branches. According to change management best practices, which step should the engineer perform BEFORE implementing the change?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a backout plan to revert the change if necessary
Creating a backout plan is a critical step in change management because it provides a documented procedure to revert the router to its previous operational state if the new routing protocol configuration causes connectivity loss or instability. Without a backout plan, the engineer risks prolonged outages across all branches while troubleshooting or attempting to reconstruct the original configuration from memory or incomplete logs. This aligns with ITIL change management best practices, which prioritize risk mitigation and service continuity.
Key principle: A backout plan outlines steps to revert a change.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Notify all branch users of the upcoming change
Why it's wrong here
Notification is important but comes after the change plan is finalized; the key technical step is having a backout plan.
✓
Create a backout plan to revert the change if necessary
Why this is correct
A backout plan is essential for minimizing risk during network changes.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
A backout plan outlines steps to revert a change.
✗
Document the current router configuration
Why it's wrong here
Documentation should be kept current at all times, not just before a change.
✗
Schedule the change during a maintenance window
Why it's wrong here
Scheduling is important but the backout plan must be in place before the change window begins.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'documenting the current configuration' (a preparatory step) with the actual change management requirement to 'create a backout plan,' which is the specific step that ensures the change can be safely undone if it fails.
Detailed technical explanation
How to think about this question
A backout plan for a routing protocol change (e.g., migrating from EIGRP to OSPF or modifying redistribution filters) should include exact CLI commands to restore the previous configuration, such as reloading a saved startup-config or applying a rollback script via archive or config replace. In real-world scenarios, a missing backout plan can lead to hours of outage if the new routing table causes black holes or routing loops, especially when BGP path selection or administrative distances are altered. The plan should also specify verification steps (e.g., ping tests, traceroutes, and BGP table checks) to confirm the revert succeeded.
KKey Concepts to Remember
A backout plan outlines steps to revert a change.
It minimizes risk and downtime during network modifications.
The plan should be created and tested before implementation.
It ensures service restoration if the change fails.
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
A backout plan outlines steps to revert a change.
Real-world example
How this comes up in practice
A practitioner preparing for the N10-009 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. A backout plan outlines steps to revert a change. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this N10-009 question in full detail.
Network Operations — This question tests Network Operations — A backout plan outlines steps to revert a change..
What is the correct answer to this question?
The correct answer is: Create a backout plan to revert the change if necessary — Creating a backout plan is a critical step in change management because it provides a documented procedure to revert the router to its previous operational state if the new routing protocol configuration causes connectivity loss or instability. Without a backout plan, the engineer risks prolonged outages across all branches while troubleshooting or attempting to reconstruct the original configuration from memory or incomplete logs. This aligns with ITIL change management best practices, which prioritize risk mitigation and service continuity.
What should I do if I get this N10-009 question wrong?
Review a backout plan outlines steps to revert a change., then practise related N10-009 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
A backout plan outlines steps to revert a change.
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