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300-410 Practice Question: Which THREE statements about the NetFlow flow…
Which THREE statements about the NetFlow flow cache and export timing are correct? (Choose THREE.)
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
✓
A flow is exported when it has been idle for the inactive timeout period, which defaults to 15 seconds.
The NetFlow flow cache stores active flows. Flows are exported when they become inactive (no new packets for a timeout period) or when they are long-lived (active timeout). The default active timeout is 30 minutes, and the default inactive timeout is 15 seconds. When the cache is full, the router may force-export the oldest flows to make room. The cache size is configurable but has a hardware-dependent maximum. Flow export does not wait for the cache to be full before exporting.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A flow is exported when it has been idle for the inactive timeout period, which defaults to 15 seconds.
Why this is correct
Correct. The inactive timeout triggers export when no packets match the flow for the configured period; default is 15 seconds.
- ✓
The default active flow timeout is 30 minutes, after which a long-lived flow is exported even if it is still active.
Why this is correct
Correct. The active timeout ensures that long flows are reported periodically; default is 30 minutes.
- ✗
Flows are only exported when the flow cache becomes 100% full.
Why it's wrong here
Incorrect. Flows are exported based on timeouts, not cache fullness. When the cache is full, the router may force-export the oldest flows, but this is not the only trigger.
- ✓
The 'ip flow-cache timeout active' command can be used to change the active timeout value.
Why this is correct
Correct. This command modifies the active timeout (in minutes). The inactive timeout is changed with 'ip flow-cache timeout inactive'.
- ✗
The maximum number of flow cache entries is fixed at 64,000 and cannot be changed.
Why it's wrong here
Incorrect. The cache size is configurable using 'ip flow-cache entries' and varies by platform; 64,000 is a common default but not a fixed maximum.
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