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300-410 Practice Question: Runs the following command to troubleshoot a…
A network engineer runs the following command to troubleshoot a Flexible NetFlow issue:
R1# show flow monitor FLOW-MONITOR-1 cache format table
Cache type: Normal Cache size: 1000 Current entries: 25 High Watermark: 50
Flows added: 1234 Flows aged: 1209 - Active timeout ( 1800 secs): 100 - Inactive timeout ( 15 secs): 1100 - Event aged: 9 - Watermark aged: 0 - Emergency aged: 0
What does the output indicate?
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 majority of flows are being aged due to the inactive timeout, indicating many short-lived flows.
The output shows the current state of the Flexible NetFlow cache. The high number of flows aged due to inactive timeout (1100 out of 1209) indicates that most flows are short-lived. The cache is not full (25 out of 1000 entries used), and no watermark or emergency aging has occurred. This is normal for traffic with many brief connections.
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 cache is experiencing watermark aging, indicating memory pressure.
Why it's wrong here
Watermark aged is 0, so no watermark aging has occurred.
- ✗
Most flows are being aged due to the active timeout, suggesting long-lived flows.
Why it's wrong here
Only 100 flows aged due to active timeout, while 1100 aged due to inactive timeout, indicating short-lived flows.
- ✓
The majority of flows are being aged due to the inactive timeout, indicating many short-lived flows.
Why this is correct
1100 out of 1209 aged flows are due to inactive timeout, which is typical for short-lived traffic like DNS or web requests.
- ✗
Emergency aging is occurring, which means the cache is full.
Why it's wrong here
Emergency aged is 0, so no emergency aging has happened.
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Same concept, more angles
1 more way this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A network engineer runs the following command to troubleshoot Flexible NetFlow cache usage: R1# show flow monitor FLOW-MONITOR-1 statistics Cache type: Normal Cache size: 1000 Current entries: 900 High Watermark: 950 Flows added: 50000 Flows aged: 49100 - Active timeout ( 1800 secs): 40000 - Inactive timeout ( 15 secs): 9000 - Event aged: 100 - Watermark aged: 0 - Emergency aged: 0 What does this output indicate?
hard- A.The cache is mostly empty and flows are aging normally.
- ✓ B.The cache is nearly full, with many long-lived flows causing active timeout aging. No watermark or emergency aging has occurred yet.
- C.Emergency aging is occurring because the cache is full.
- D.Watermark aging has occurred, indicating the cache size needs to be increased.
Why B: The cache is nearly full (900 out of 1000 entries). The high watermark is 950, which is close to the cache size. Most flows are aged due to active timeout (40000), indicating long-lived flows. The cache is under pressure but not yet experiencing watermark or emergency aging.
Last reviewed: Jun 19, 2026
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