- 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.
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`.
300-410 NetFlow and Flexible NetFlow Practice Question
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?
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: 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 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
Static NAT maps one inside address to one outside address.
- ✗
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: 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
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
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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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 — Static NAT maps one inside address to one outside address..
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?
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.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 19, 2026
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.
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