Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A network administrator is about to implement a QoS policy on a core router. According to change management best practices, which step should the administrator perform FIRST to ensure the policy can be reverted if it causes unexpected issues?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Save the running configuration to the startup configuration.
This overwrites the startup configuration with the current running config, which may already include partial changes. It does not create a separate backup for rollback.
B
Best answer
Back up the current configuration to an external TFTP or SCP server.
A backup stored externally provides a reliable restore point that is independent of the router's memory. This is the best practice before making major changes.
C
Distractor review
Test the QoS policy in a lab environment.
Testing is ideal, but if a lab is unavailable, the immediate step is to back up the production configuration. The question asks what should be done FIRST before implementing.
D
Distractor review
Schedule a maintenance window and notify the help desk.
While notification and scheduling are important, they should follow the backup step. Without a backup, there is no quick way to revert if something fails.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A network engineer needs to connect two switches located 400 meters apart. The cable run includes high electromagnetic interference from nearby machinery. The engineer decides to use fiber optic cabling. Which transceiver type and fiber combination should be used to ensure the link reaches 400 meters while remaining cost-effective?
Question 2
A network engineer is designing a new switched network and needs to ensure that broadcast traffic from one department does not reach another department's workstations. The engineer plans to use VLANs. Which of the following must be configured on the switches to isolate broadcast domains as intended?
Question 3
A security engineer is configuring a site-to-site VPN between two branch offices. The requirement is to encrypt all traffic between the two networks using IPsec. Which IPsec mode should be used to encrypt the entire IP packet including the original header?
Question 4
A network administrator is connecting two switches to increase bandwidth and provide redundancy. Which technology should be used to combine multiple physical links into a single logical link?
Question 5
A network administrator is experiencing issues where unauthorized devices are offering IP addresses to clients, causing connectivity problems. Which security feature should be enabled on switches to prevent this?
Question 6
A network administrator is troubleshooting a connectivity issue and suspects the problem is related to the physical cabling. At which layer of the OSI model should the administrator begin their investigation?
FAQ
Questions learners often ask
What does this N10-009 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Back up the current configuration to an external TFTP or SCP server. — Before making configuration changes, the administrator should back up the current router configuration. This provides a safe restore point if the QoS policy disrupts network operations. Saving the running-config to startup-config (A) would overwrite the current startup config with any in-process changes, potentially making it harder to revert. Testing in a lab (B) is valuable but may not be feasible in all environments; the most immediate step is to back up the current production config. Scheduling a maintenance window (C) and informing the help desk (D) are important but should occur after the backup and as part of the change plan.
What should I do if I get this N10-009 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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