Question 626 of 2,152

NetFlow and Flexible NetFlow →hardMultiple SelectObjective-mapped

300-410 NetFlow and Flexible NetFlow Practice Question

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.

An engineer configures Flexible NetFlow with a user-defined flow record that includes 'match ipv4 source address' and 'collect counter bytes'. Which TWO additional statements about this configuration are true? (Choose TWO.)

Question 1hardmulti select

Read the full network assurance explanation →

A
The flow record must be applied directly to an interface using the 'ip flow record' command.
Why wrong: Incorrect. The flow record is not applied directly to an interface. It is referenced by a flow monitor, which is then applied to the interface via 'ip flow monitor'.
B
The 'match ipv4 source address' command defines a key field that is used to uniquely identify flows.
Correct. Match fields are key fields; flows are differentiated based on their values. Here, only the source IP is used as a key.
C
The 'collect counter bytes' command causes the router to count the total number of bytes for each unique flow.
Correct. The 'collect counter bytes' field is a non-key field that accumulates the byte count for each flow key.
D
If no 'match' commands are configured, the router will use the default match fields from the 'netflow-original' record.
Why wrong: Incorrect. A user-defined flow record must include at least one 'match' command; otherwise, the configuration is rejected.
E
The flow record can be used by both IPv4 and IPv6 traffic simultaneously without additional configuration.
Why wrong: Incorrect. Flow records are protocol-specific. To monitor both IPv4 and IPv6, you need separate flow records (e.g., 'match ipv4 ...' and 'match ipv6 ...') or use the 'ip' keyword for both.

Full breakdown with real-world context →

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 'match ipv4 source address' command defines a key field that is used to uniquely identify flows.

In Flexible NetFlow, the 'match' fields define the flow key; flows are uniquely identified by the combination of all match fields. The 'collect' fields define non-key data that is aggregated per flow. The flow record must be referenced by a flow monitor, which is then applied to an interface. The default flow record is 'netflow-original', which includes many default keys. The 'match' fields cannot be omitted; at least one match field is required. The 'collect' fields are optional and can include counters, timestamps, etc.

Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

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 flow record must be applied directly to an interface using the 'ip flow record' command.
Why it's wrong here
Incorrect. The flow record is not applied directly to an interface. It is referenced by a flow monitor, which is then applied to the interface via 'ip flow monitor'.
✓
The 'match ipv4 source address' command defines a key field that is used to uniquely identify flows.
Why this is correct
Correct. Match fields are key fields; flows are differentiated based on their values. Here, only the source IP is used as a key.
Related concept
Static NAT maps one inside address to one outside address.
✓
The 'collect counter bytes' command causes the router to count the total number of bytes for each unique flow.
Why this is correct
Correct. The 'collect counter bytes' field is a non-key field that accumulates the byte count for each flow key.
Related concept
Static NAT maps one inside address to one outside address.
✗
If no 'match' commands are configured, the router will use the default match fields from the 'netflow-original' record.
Why it's wrong here
Incorrect. A user-defined flow record must include at least one 'match' command; otherwise, the configuration is rejected.
✗
The flow record can be used by both IPv4 and IPv6 traffic simultaneously without additional configuration.
Why it's wrong here
Incorrect. Flow records are protocol-specific. To monitor both IPv4 and IPv6, you need separate flow records (e.g., 'match ipv4 ...' and 'match ipv6 ...') or use the 'ip' keyword for both.

Common exam traps

Common exam trap: NAT rules depend on direction and matching traffic

NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.

Trap categories for this question

Keyword trap
Incorrect. Flow records are protocol-specific. To monitor both IPv4 and IPv6, you need separate flow records (e.g., 'match ipv4 ...' and 'match ipv6 ...') or use the 'ip' keyword for both.
Command / output trap
Incorrect. A user-defined flow record must include at least one 'match' command; otherwise, the configuration is rejected.

Detailed technical explanation

How to think about this question

NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.

KKey Concepts to Remember

Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.

TExam Day Tips

Identify inside and outside interfaces first.
Check whether the scenario needs static NAT, dynamic NAT or PAT.
Do not confuse NAT matching ACLs with normal packet-filtering intent.

Key takeaway

NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.

Real-world example

How this comes up in practice

A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

What to study next

Got this wrong? Here's your next step.

Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 300-410 NAT questions on configuration and troubleshooting.

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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 — Static NAT maps one inside address to one outside address..

What is the correct answer to this question?

The correct answer is: The 'match ipv4 source address' command defines a key field that is used to uniquely identify flows. — In Flexible NetFlow, the 'match' fields define the flow key; flows are uniquely identified by the combination of all match fields. The 'collect' fields define non-key data that is aggregated per flow. The flow record must be referenced by a flow monitor, which is then applied to an interface. The default flow record is 'netflow-original', which includes many default keys. The 'match' fields cannot be omitted; at least one match field is required. The 'collect' fields are optional and can include counters, timestamps, etc.

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

What is the key concept behind this question?

Static NAT maps one inside address to one outside address.

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