hardMultiple ChoiceObjective-mapped
300-410 Practice Question: A large enterprise network is experiencing…
A large enterprise network is experiencing intermittent loss of NetFlow data from multiple routers. Router R1 has the following relevant configuration: flow exporter EXPORTER-1 destination 10.1.1.1 source Loopback0 transport udp 2055 export-protocol netflow-v9. Router R2 shows: R2# show flow exporter EXPORTER-1 statistics | include (Packets|Errors) Packets exported: 0, Errors: 0. The network uses OSPF, and R1's Loopback0 is reachable via a summary route. What is the root cause?
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 collector IP is not reachable due to a missing route; the summary route for Loopback0's subnet does not include the /32 host route.
The issue is that the NetFlow exporter's source interface (Loopback0) is not the same as the interface used to reach the collector (10.1.1.1). OSPF summarization may cause the source IP to be unreachable from the collector's perspective due to routing asymmetry or the summary route not including the specific /32. The correct fix is to ensure the source interface is the one with a route to the collector, or to use a loopback that is explicitly advertised.
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 exporter is misconfigured with the wrong export protocol; it should be netflow-v5.
Why it's wrong here
NetFlow v9 is valid and commonly used; v5 is older and less capable.
- ✓
The collector IP is not reachable due to a missing route; the summary route for Loopback0's subnet does not include the /32 host route.
Why this is correct
If Loopback0's /32 is not in the routing table of the collector's router, packets from that source may be dropped. The summary route may not cover the exact host address.
- ✗
The UDP port 2055 is blocked by an ACL on R1's outbound interface.
Why it's wrong here
The show output shows 0 packets exported, not dropped packets; ACL blocking would typically show errors or drops.
- ✗
The flow monitor is not applied to any interface, so no flows are being exported.
Why it's wrong here
The question states NetFlow data loss, but the exporter statistics show 0 packets exported; this could be due to no flows, but the scenario implies flows exist but are not exported.
Visual reference
Quick reference
Routing Protocol Comparison
| Protocol | Metric | Max Hops | Algorithm | Type |
|---|---|---|---|---|
| RIP v2 | Hop count | 15 | Bellman-Ford | Distance vector |
| OSPF | Cost (bandwidth) | Unlimited | Dijkstra (SPF) | Link state |
| EIGRP | Composite metric | Unlimited | DUAL | Hybrid |
| IS-IS | Cost | Unlimited | Dijkstra | Link state |
| BGP | Policy / attributes | Unlimited | Path vector | Path vector |
RIP's 15-hop limit makes it unsuitable for large networks. OSPF and EIGRP dominate modern enterprise deployments.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
NetFlow Configuration
NetFlow Configuration is the process of setting up Cisco devices to collect and export metadata about network traffic flows for monitoring, analysis, and troubleshooting.
Key term
OSPF Route Summarization
OSPF route summarization is a technique that combines multiple smaller network routes into a single, larger route advertisement to reduce the size of routing tables and improve network stability.
About these practice questions
This 300-410 question is part of Courseiva's 1,966-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.