The answer is that Router R1 does not have a route to reach 192.0.2.1. Without a valid IP route in the routing table, NTP packets cannot be forwarded to the upstream server, so the client remains unsynchronized and stuck at stratum 16, which indicates the clock has no reference. This is the most common cause of NTP client synchronization troubleshooting failures in a CCNA 200-301 v2 scenario, as the exam frequently tests the prerequisite that reachability must exist before any time synchronization can occur. A common trap is assuming NTP authentication or version mismatches are to blame, but the router does not need authentication as a client, and NTP version negotiation is backward-compatible. Since the problem states there is no firewall, the only remaining layer-3 barrier is a missing route. Memory tip: “No route, no root” — without a route to the NTP server, the clock has no authoritative time source to synchronize with.
CCNA AI and Network Operations Practice Question
This 200-301 practice question tests your understanding of ai and network operations. 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.
Exhibit
R1# show ntp status
Clock is synchronized, stratum 16, reference is 0.0.0.0
nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**10
ntp uptime is 100 minutes, resolution is 4000 msec
reference time is D8C4E1C0.00000000 (12:34:56.000 UTC Mon Mar 15 2021)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 0.00 msec, peer dispersion is 0.00 msec
R1# show ntp associations
address ref clock st when poll reach delay offset disp
*~192.0.2.1 0.0.0.0 16 - 64 0 0.000 0.000 16000.
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
A network administrator notices that the NTP server on Router R1 is not synchronizing with the upstream NTP server at 192.0.2.1. The router is configured as an NTP client, but show ntp status indicates the clock is unsynchronized and the stratum is 16. There is no firewall between R1 and 192.0.2.1. What is the most likely cause of this issue?
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.
R1# show ntp status
Clock is synchronized, stratum 16, reference is 0.0.0.0
nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**10
ntp uptime is 100 minutes, resolution is 4000 msec
reference time is D8C4E1C0.00000000 (12:34:56.000 UTC Mon Mar 15 2021)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 0.00 msec, peer dispersion is 0.00 msec
R1# show ntp associations
address ref clock st when poll reach delay offset disp
*~192.0.2.1 0.0.0.0 16 - 64 0 0.000 0.000 16000.
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
A
The NTP server at 192.0.2.1 is not configured as a peer on R1.
Why wrong: The output shows the server is configured as a peer (indicated by '~ configured'), so this is not the issue.
B
Router R1 does not have a route to reach 192.0.2.1.
Without a route to the upstream NTP server, the NTP client cannot send or receive packets, leaving it unsynchronized at stratum 16.
C
The NTP server at 192.0.2.1 is not using NTP version 4.
Why wrong: There is no indication of a version mismatch in the output. The server is reachable but unsynchronized.
D
The NTP server at 192.0.2.1 has a firewall blocking NTP traffic.
Why wrong: While a firewall could block NTP, the reach value of 0 is more consistent with a routing issue. Additionally, the server's stratum of 16 suggests it is unsynchronized itself, not that traffic is blocked.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Router R1 does not have a route to reach 192.0.2.1.
The most likely cause is that Router R1 lacks a route to the upstream NTP server at 192.0.2.1. Without a valid IP route, NTP packets cannot reach the server, so the client remains unsynchronized with stratum 16. The other options are incorrect: A is not required for client operation, C is irrelevant because NTP version negotiation works across versions, and D is ruled out by the absence of a firewall.
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 NTP server at 192.0.2.1 is not configured as a peer on R1.
Why it's wrong here
The output shows the server is configured as a peer (indicated by '~ configured'), so this is not the issue.
✓
Router R1 does not have a route to reach 192.0.2.1.
Why this is correct
Without a route to the upstream NTP server, the NTP client cannot send or receive packets, leaving it unsynchronized at stratum 16.
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 NTP server at 192.0.2.1 is not using NTP version 4.
Why it's wrong here
There is no indication of a version mismatch in the output. The server is reachable but unsynchronized.
✗
The NTP server at 192.0.2.1 has a firewall blocking NTP traffic.
Why it's wrong here
While a firewall could block NTP, the reach value of 0 is more consistent with a routing issue. Additionally, the server's stratum of 16 suggests it is unsynchronized itself, not that traffic is blocked.
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.
✓Router R1 does not have a route to reach 192.0.2.1.Correct answer▾
Why this is correct
Without a route to the upstream NTP server, the NTP client cannot send or receive packets, leaving it unsynchronized at stratum 16.
✗The NTP server at 192.0.2.1 is not configured as a peer on R1.Wrong answer — click to see why▾
Why this is wrong here
The ntp server command configures the router as a client, not a peer, so peer configuration is not required for synchronization.
Why candidates choose this
Students may confuse the terms 'peer' and 'server' in NTP configuration. They might think that a peer relationship is required for synchronization, but in this scenario, the router is configured as an NTP client, and the server is correctly specified.
✗The NTP server at 192.0.2.1 is not using NTP version 4.Wrong answer — click to see why▾
Why this is wrong here
NTP clients and servers can negotiate versions; using an older version does not prevent synchronization.
Why candidates choose this
Students may recall that NTP version mismatches can cause synchronization failures. However, in this scenario, the reach value of 0 points to a connectivity issue rather than a version mismatch.
✗The NTP server at 192.0.2.1 has a firewall blocking NTP traffic.Wrong answer — click to see why▾
Why this is wrong here
The stem explicitly states there is no firewall, ruling out this cause.
Why candidates choose this
Firewalls are common culprits for blocking NTP traffic in enterprise networks. However, the stratum 16 on the server indicates it is not synchronized to a reliable time source, which is a different issue from firewall blocking.
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 misconception that NTP configuration alone ensures synchronization, but the trap here is that candidates overlook the prerequisite of IP reachability, assuming the ntp server command handles routing automatically.
Trap categories for this question
Command / output trap
The output shows the server is configured as a peer (indicated by '~ configured'), so this is not the issue.
Detailed technical explanation
How to think about this question
NTP uses UDP port 123, and the client sends periodic NTP packets to the server. If the client has no route to the server's IP address, the packets are dropped, and the client remains in stratum 16 (unsynchronized). The ntp server command only specifies the server; it does not automatically install a route, so the administrator must ensure reachability via a static or dynamic route. In real-world scenarios, this often occurs when the NTP server is on a different subnet without a default gateway or proper routing configuration.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 200-301 question in full detail.
AI and Network Operations — This question tests AI and Network Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Router R1 does not have a route to reach 192.0.2.1. — The most likely cause is that Router R1 lacks a route to the upstream NTP server at 192.0.2.1. Without a valid IP route, NTP packets cannot reach the server, so the client remains unsynchronized with stratum 16. The other options are incorrect: A is not required for client operation, C is irrelevant because NTP version negotiation works across versions, and D is ruled out by the absence of a firewall.
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.
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
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This 200-301 practice question is part of Courseiva's free Cisco 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 200-301 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.