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300-410 Practice Question: Which TWO statements about NetFlow version 9 and…
Which TWO statements about NetFlow version 9 and Flexible NetFlow export format are true? (Choose TWO.)
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
✓
NetFlow version 9 uses a template-based architecture that allows the collector to dynamically learn the fields being exported.
NetFlow version 9 uses templates to define the format of exported data, which allows flexibility. Flexible NetFlow uses version 9 as its default export format. Version 5 has a fixed format and does not support templates. The exporter configuration includes the destination IP and UDP port (default 2055). The template refresh interval is configurable using the 'template timeout' command under the exporter. Version 9 supports both IPv4 and IPv6 in the same export stream via separate templates.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
NetFlow version 9 uses a template-based architecture that allows the collector to dynamically learn the fields being exported.
Why this is correct
Correct. Version 9 sends templates periodically; the collector uses them to parse the data records.
- ✗
Flexible NetFlow can only export data using NetFlow version 5 format.
Why it's wrong here
Incorrect. Flexible NetFlow uses NetFlow version 9 as the default export format; version 5 is not supported with Flexible NetFlow.
- ✓
The default UDP port for NetFlow export is 2055.
Why this is correct
Correct. Port 2055 is the IANA-assigned default for NetFlow export; many collectors use this port.
- ✗
The template refresh interval is fixed at 20 minutes and cannot be changed.
Why it's wrong here
Incorrect. The template refresh interval is configurable using the 'template timeout' command under the flow exporter (default is 30 minutes).
- ✗
NetFlow version 9 supports only IPv4 flow data; IPv6 requires version 5.
Why it's wrong here
Incorrect. Version 9 supports both IPv4 and IPv6 via separate templates; version 5 does not support IPv6 at all.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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