- A
The logging trap level is set to informational, so only high-severity messages are sent with correct timestamps.
Why wrong: Setting the logging trap level to informational actually allows all messages of severity informational and higher (levels 0–6) to be sent. Even if only emergencies were sent, their timestamps would still be accurate if the router’s clock is correct.
- B
The router’s NTP client is configured with an incorrect authentication key.
NTP can use authentication keys to verify server identity. If the client key does not match the server’s key, the router will not trust the time updates and will fail to synchronize. This leaves the router’s clock uncorrected, causing incorrect timestamps in syslog and NetFlow records.
- C
The SNMP v3 user’s privacy password is incorrect, causing the NMS to reject syslog traps.
Why wrong: SNMP v3 authentication and privacy settings control SNMP traps, which are separate from syslog messages. Syslog uses UDP port 514 and does not depend on SNMP v3 credentials. An SNMP v3 misconfiguration would affect trap delivery, not syslog timestamps or NetFlow exports.
- D
The IP flow cache timeout is set too low, causing NetFlow timestamps to appear skewed.
Why wrong: The flow cache timeout determines how long an active flow is kept in the cache before it is exported. A lower timeout exports flows more frequently but does not alter the actual start or end times recorded in the flow records. The timestamps in NetFlow records come from the system clock, not the cache timer.
Quick Answer
The correct answer is that the router’s NTP client is configured with an incorrect authentication key. When NTP authentication fails due to a mismatched or missing key, the router cannot synchronize its system clock with the NTP server, causing its timestamp to drift away from the correct time. This explains why both syslog messages and NetFlow exports show consistently incorrect timestamps—since both rely on the router’s system clock, a single time-sync failure affects all time-stamped data. On the CCNA 200-301 v2 exam, this scenario tests your ability to isolate a system-wide time issue from isolated problems like interface failures or SNMP misconfigurations; a common trap is to focus on individual services rather than the shared clock source. Remember: if all timestamps are wrong, suspect the clock, not the service. A handy memory tip is “One key to rule them all”—a single NTP authentication key failure locks the entire device out of accurate time.
CCNA Network Services and Security Practice Question
This 200-301 practice question tests your understanding of network services and security. 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 administrator notices that syslog messages from a core router are arriving at the syslog server with timestamps that are hours behind other devices. The router’s NetFlow exports also show incorrect start and end times for flows, making traffic analysis unreliable. The administrator verifies that all router interfaces are up and that the SNMP community strings on the router match the NMS.
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 router’s NTP client is configured with an incorrect authentication key.
The router's timestamps are incorrect for both syslog messages and NetFlow exports, which points to a system-wide time synchronization issue. NTP (Network Time Protocol) is responsible for maintaining accurate time on network devices, and if the NTP client is configured with an incorrect authentication key, it will fail to synchronize with the NTP server, causing the router's clock to drift. This explains why all time-stamped data (syslog and NetFlow) is consistently behind.
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 logging trap level is set to informational, so only high-severity messages are sent with correct timestamps.
Why it's wrong here
Setting the logging trap level to informational actually allows all messages of severity informational and higher (levels 0–6) to be sent. Even if only emergencies were sent, their timestamps would still be accurate if the router’s clock is correct.
- ✓
The router’s NTP client is configured with an incorrect authentication key.
Why this is correct
NTP can use authentication keys to verify server identity. If the client key does not match the server’s key, the router will not trust the time updates and will fail to synchronize. This leaves the router’s clock uncorrected, causing incorrect timestamps in syslog and NetFlow records.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The SNMP v3 user’s privacy password is incorrect, causing the NMS to reject syslog traps.
- ✗
The IP flow cache timeout is set too low, causing NetFlow timestamps to appear skewed.
Why it's wrong here
The flow cache timeout determines how long an active flow is kept in the cache before it is exported. A lower timeout exports flows more frequently but does not alter the actual start or end times recorded in the flow records. The timestamps in NetFlow records come from the system clock, not the cache timer.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 200-301 exam frequently reuses these exact scenarios with slightly different constraints.
✓The router’s NTP client is configured with an incorrect authentication key.Correct answer▾
Why this is correct
NTP can use authentication keys to verify server identity. If the client key does not match the server’s key, the router will not trust the time updates and will fail to synchronize. This leaves the router’s clock uncorrected, causing incorrect timestamps in syslog and NetFlow records.
✗The logging trap level is set to informational, so only high-severity messages are sent with correct timestamps.Wrong answer — click to see why▾
Why this is wrong here
Logging trap level controls which severity messages are forwarded, not the accuracy of the timestamps.
✗The SNMP v3 user’s privacy password is incorrect, causing the NMS to reject syslog traps.Wrong answer — click to see why▾
Why this is wrong here
SNMP v3 misconfiguration impacts SNMP traps, not syslog messages, which are sent independently via a different transport.
✗The IP flow cache timeout is set too low, causing NetFlow timestamps to appear skewed.Wrong answer — click to see why▾
Why this is wrong here
Cache timeout affects flow export frequency, not the accuracy of the timestamps inside the flow data.
Analysis generated from the official 200-301blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between time synchronization issues (NTP) and logging/SNMP configuration issues, so candidates may incorrectly attribute timestamp problems to syslog or SNMP settings rather than the underlying system clock.
Detailed technical explanation
How to think about this question
NTP authentication uses MD5 or SHA-1 keys to verify that time updates come from a trusted source; if the key ID or key string is mismatched between client and server, the NTP client will reject all time updates and log 'NTP authentication failed' messages. In a real-world scenario, a router with a drifted clock can cause syslog correlation issues in a SIEM and make NetFlow-based traffic baselines inaccurate, leading to false security incident timelines. The 'show ntp status' and 'show ntp associations' commands are used to verify synchronization state and authentication status.
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.
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
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 200-301 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
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FAQ
Questions learners often ask
What does this 200-301 question test?
Network Services and Security — This question tests Network Services and Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The router’s NTP client is configured with an incorrect authentication key. — The router's timestamps are incorrect for both syslog messages and NetFlow exports, which points to a system-wide time synchronization issue. NTP (Network Time Protocol) is responsible for maintaining accurate time on network devices, and if the NTP client is configured with an incorrect authentication key, it will fail to synchronize with the NTP server, causing the router's clock to drift. This explains why all time-stamped data (syslog and NetFlow) is consistently behind.
What should I do if I get this 200-301 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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