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350-401 NetFlow v9 Practice Question
Which two statements about NetFlow 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 v9 is template-based, allowing flexible and extensible flow record formats. [CORRECT]
Three statements are true: B (NetFlow v9 is template-based), C (Sampled NetFlow reduces CPU impact), and E (NetFlow can be used for IPv4 and IPv6 monitoring). The question asks for two, but three are factually correct; the original marking of E as wrong is inaccurate. A uses TCP instead of UDP, and D incorrectly claims full payload inclusion.
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 uses TCP port 2055 for exporting flow records.
Why it's wrong here
NetFlow typically uses UDP (not TCP) for exporting flow records. TCP is not used; UDP port 2055 is common, but the protocol is UDP.
- ✓
NetFlow v9 is template-based, allowing flexible and extensible flow record formats. [CORRECT]
Why this is correct
NetFlow v9 uses a template-based architecture that allows flexible and extensible flow record formats. This is a key feature of v9.
- ✓
Sampled NetFlow reduces CPU impact by analyzing only a subset of packets. [CORRECT]
Why this is correct
Sampled NetFlow only analyzes a subset of packets, reducing CPU impact while still providing statistical flow data.
- ✗
NetFlow records include the full payload of each packet.
Why it's wrong here
NetFlow records contain metadata about flows (e.g., source/destination IP, ports, protocol), not the full packet payload.
- ✓
NetFlow can be used for both IPv4 and IPv6 traffic monitoring. [wrong]
Why this is correct
NetFlow v5 does not support IPv6; support was added in v9 and IPFIX, so this statement is not true for all versions of NetFlow.
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Last reviewed: Jun 18, 2026
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