Question 896 of 2,152

NetFlow and Flexible NetFlow →mediumMultiple ChoiceObjective-mapped

Resolving NetFlow Export Source Unreachable Errors

This 300-410 practice question tests your understanding of netflow and flexible netflow. 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 runs the following command on Router R1:

R1# show flow exporter EXPORTER-1

Flow Exporter EXPORTER-1: Description: Exports to collector Export protocol: NetFlow Version 9 Transport Configuration: Destination IP address: 192.168.1.100 Source IP address: 10.0.0.1 Transport Protocol: UDP Destination Port: 2055 Source Port: 0 Collector Configuration: VRFs: Default Options Configuration: Sampler: Not configured Export Statistics: Number of Flows exported: 5000 Number of Packets exported: 250 Number of Source IP address unreachable: 10 Number of Packets dropped: 0

Based on this output, what is the most likely 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.

A
The destination IP address is unreachable.
Why wrong: The counter is for source IP unreachable, not destination.
B
The source IP address 10.0.0.1 is not reachable from the destination, causing some packets to fail.
The 'Source IP address unreachable' counter indicates that the source IP is not reachable from the destination, likely due to a missing route or interface issue.
C
The UDP port 2055 is blocked.
Why wrong: If blocked, packets would be dropped, but the drop counter is 0.
D
The exporter is not sending any packets.
Why wrong: 250 packets have been exported.

Full breakdown with real-world context →

Quick Answer

The answer is that the source IP address 10.0.0.1 is not reachable from the collector, causing the NetFlow export source unreachable errors. This is correct because the show flow exporter output reveals ten "Source IP address unreachable" events, which specifically indicate that the router’s NetFlow exporter cannot successfully route packets from the configured source interface (10.0.0.1) to the destination collector at 192.168.1.100. While flows are still being exported, these intermittent failures point to a routing issue, such as a missing return route or an unstable interface, rather than a configuration or protocol mismatch. On the Cisco CCNP ENARSI 300-410 exam, this scenario tests your ability to interpret NetFlow exporter statistics and differentiate between source unreachability and other common errors like dropped packets or port misconfigurations. A common trap is assuming that successful exports mean the source is always reachable, but the counter for unreachable sources reveals transient path failures. Memory tip: "Source unreachable = routing reachability, not export failure."

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 source IP address 10.0.0.1 is not reachable from the destination, causing some packets to fail.

The exporter has exported flows, but there are 10 Source IP address unreachable errors. This indicates that the source IP address (10.0.0.1) is not reachable from the destination at times, possibly due to routing issues or interface flapping.

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 destination IP address is unreachable.
Why it's wrong here
The counter is for source IP unreachable, not destination.
✓
The source IP address 10.0.0.1 is not reachable from the destination, causing some packets to fail.
Why this is correct
The 'Source IP address unreachable' counter indicates that the source IP is not reachable from the destination, likely due to a missing route or interface issue.
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 UDP port 2055 is blocked.
Why it's wrong here
If blocked, packets would be dropped, but the drop counter is 0.
✗
The exporter is not sending any packets.
Why it's wrong here
250 packets have been exported.

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.

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?

NetFlow and Flexible NetFlow — This question tests NetFlow and Flexible NetFlow — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The source IP address 10.0.0.1 is not reachable from the destination, causing some packets to fail. — The exporter has exported flows, but there are 10 Source IP address unreachable errors. This indicates that the source IP address (10.0.0.1) is not reachable from the destination at times, possibly due to routing issues or interface flapping.

What should I do if I get this 300-410 question wrong?

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.

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