- A
The flow record is missing 'match ipv4 source prefix-length' and 'match ipv4 destination prefix-length' to collect AS numbers.
Why wrong: Prefix-length is not required for AS collection; the 'collect routing source as' command is sufficient.
- B
The router must have BGP configured and the flow record must include 'match ipv4 bgp source-as' and 'match ipv4 bgp destination-as' to collect AS numbers.
To collect BGP AS numbers, the flow record must match BGP AS attributes using 'match ipv4 bgp source-as' and 'match ipv4 bgp destination-as'. The 'collect routing source as' command alone is insufficient without the corresponding match.
- C
The flow monitor is missing the 'cache timeout inactive' command to properly age out flows.
Why wrong: While an inactive timeout is recommended, it is not mandatory; the configuration is valid without it.
- D
The configuration is correct; AS numbers will be collected automatically from the routing table.
Why wrong: AS numbers are not automatically collected; they must be explicitly matched and collected in the flow record.
Troubleshooting Missing BGP AS Collection in NetFlow Records
This 300-410 practice question tests your understanding of netflow and flexible netflow. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
Examine this partial configuration on router R5:
flow record RECORD-3 match ipv4 source address match ipv4 destination address match ipv4 protocol collect routing source as collect routing destination as ! flow monitor MONITOR-5 record RECORD-3 cache timeout active 60 !
interface GigabitEthernet0/5 ip flow monitor MONITOR-5 input
!
What is missing or incorrect in this configuration?
Quick Answer
The answer is that the flow record must include `match ipv4 bgp source-as` and `match ipv4 bgp destination-as` instead of `collect routing source as` and `collect routing destination as`. This is because the `collect routing as` commands capture AS numbers from the routing table (typically the originating AS of a prefix), not the BGP path attributes. To populate a NetFlow record with the actual BGP AS numbers seen in the AS_PATH, Flexible NetFlow requires the explicit `match ipv4 bgp` keywords, which pull the first AS in the path for the source and destination. On the Cisco CCNP ENARSI 300-410 exam, this is a classic trap: candidates often confuse the generic `collect routing` commands with BGP-specific collection, leading to missing BGP AS collection in NetFlow records. The router must also have BGP configured and an active BGP session for these fields to populate. Memory tip: think “BGP needs BGP keywords”—if you want the AS_PATH numbers, use `match ipv4 bgp`, not `collect routing`.
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 router must have BGP configured and the flow record must include 'match ipv4 bgp source-as' and 'match ipv4 bgp destination-as' to collect AS numbers.
This question tests knowledge of BGP AS number collection requirements in Flexible NetFlow.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 is missing 'match ipv4 source prefix-length' and 'match ipv4 destination prefix-length' to collect AS numbers.
Why it's wrong here
Prefix-length is not required for AS collection; the 'collect routing source as' command is sufficient.
- ✓
The router must have BGP configured and the flow record must include 'match ipv4 bgp source-as' and 'match ipv4 bgp destination-as' to collect AS numbers.
Why this is correct
To collect BGP AS numbers, the flow record must match BGP AS attributes using 'match ipv4 bgp source-as' and 'match ipv4 bgp destination-as'. The 'collect routing source as' command alone is insufficient without the corresponding match.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The flow monitor is missing the 'cache timeout inactive' command to properly age out flows.
Why it's wrong here
While an inactive timeout is recommended, it is not mandatory; the configuration is valid without it.
- ✗
The configuration is correct; AS numbers will be collected automatically from the routing table.
Why it's wrong here
AS numbers are not automatically collected; they must be explicitly matched and collected in the flow record.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
Prefix-length is not required for AS collection; the 'collect routing source as' command is sufficient.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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NetFlow and Flexible NetFlow — study guide chapter
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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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The router must have BGP configured and the flow record must include 'match ipv4 bgp source-as' and 'match ipv4 bgp destination-as' to collect AS numbers. — This question tests knowledge of BGP AS number collection requirements in Flexible NetFlow.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 19, 2026
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