- A
The router's NVRAM has a hardware failure and lost the configuration.
Why wrong: Hardware failure is possible but less common; the more likely cause is that the configuration was never saved to NVRAM.
- B
The engineer did not execute 'copy running-config startup-config' before the reboot.
The router had been running for 200 days without a save; after reload, the running-config is lost, and startup-config is empty because it was never saved.
- C
The 'boot system' command points to a TFTP server that also contains a configuration file, overwriting the local startup-config.
Why wrong: The 'boot system' command only specifies the IOS image; it does not affect the startup configuration unless a 'boot config' command is used.
- D
The router's configuration register is set to 0x2142, ignoring startup-config.
Why wrong: Configuration register 0x2142 causes the router to bypass startup-config on boot, but the startup-config would still be present; 'show startup-config' would show the configuration, not 'not present'.
300-410 Device Management Practice Question
This 300-410 practice question tests your understanding of device management. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 is troubleshooting a router that has been running for 200 days. The router experiences a sudden reboot, and after reload, the configuration is missing. 'show startup-config' returns 'startup-config is not present'. The engineer checks the boot variable: 'boot system flash:ios-image.bin'. What is the most likely cause of the configuration loss?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
The engineer did not execute 'copy running-config startup-config' before the reboot.
The router likely has a corrupt NVRAM or the startup configuration was never saved. However, the key clue is that the router has been running for 200 days without a save, and the 'copy running-config startup-config' was not performed, so the startup-config is empty or missing.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The router's NVRAM has a hardware failure and lost the configuration.
Why it's wrong here
Hardware failure is possible but less common; the more likely cause is that the configuration was never saved to NVRAM.
- ✓
The engineer did not execute 'copy running-config startup-config' before the reboot.
Why this is correct
The router had been running for 200 days without a save; after reload, the running-config is lost, and startup-config is empty because it was never saved.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The 'boot system' command points to a TFTP server that also contains a configuration file, overwriting the local startup-config.
Why it's wrong here
The 'boot system' command only specifies the IOS image; it does not affect the startup configuration unless a 'boot config' command is used.
- ✗
The router's configuration register is set to 0x2142, ignoring startup-config.
Why it's wrong here
Configuration register 0x2142 causes the router to bypass startup-config on boot, but the startup-config would still be present; 'show startup-config' would show the configuration, not 'not present'.
Common exam traps
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.
Trap categories for this question
Command / output trap
The 'boot system' command only specifies the IOS image; it does not affect the startup configuration unless a 'boot config' command is used.
Detailed technical explanation
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this 300-410 question test?
Device Management — This question tests Device Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The engineer did not execute 'copy running-config startup-config' before the reboot. — The router likely has a corrupt NVRAM or the startup configuration was never saved. However, the key clue is that the router has been running for 200 days without a save, and the 'copy running-config startup-config' was not performed, so the startup-config is empty or missing.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 18, 2026
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