20+ practice questions focused on NetFlow and Telemetry — one of the most tested topics on the ENCOR 350-401 exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start NetFlow and Telemetry PracticeA network engineer is troubleshooting intermittent packet loss on a WAN link connecting two data centers. The engineer suspects that certain traffic types are being dropped but needs to confirm this without impacting production. The engineer has access to Cisco IOS-XE routers at both ends. Which approach should the engineer use to identify the specific flows being dropped?
Explanation: NetFlow can be used to monitor traffic flows and identify drops, but traditional NetFlow does not capture drops. The correct answer uses Flexible NetFlow with a flow monitor that includes the 'drop' keyword to capture dropped packets, which is the most direct method. Option B is incorrect because SNMP polling of interface counters shows aggregate drops but not per-flow. Option C is incorrect because EEM alone cannot capture per-flow drop details. Option D is incorrect because IP SLA measures performance but not drop causation per flow.
A large enterprise is migrating from traditional SNMP-based monitoring to streaming telemetry for better scalability and real-time visibility. The network team has Cisco Nexus 9000 switches running NX-OS. They want to stream interface counters and BGP neighbor state changes to a collector. Which telemetry technology should they implement?
Explanation: Model-driven telemetry (MDT) using gRPC or gNMI is the modern approach for streaming structured data from NX-OS devices. Option A is correct because MDT supports both periodic and event-driven subscriptions. Option B is incorrect because NetFlow is for flow data, not interface counters or BGP state. Option C is incorrect because SNMP traps are event-driven but not scalable for high-frequency streaming. Option D is incorrect because IP SLA is for active measurements, not streaming device state.
A network engineer is configuring NetFlow on a Cisco ISR 4451 router to analyze traffic patterns. The engineer wants to export flow data to a collector every 60 seconds. After applying the configuration, the engineer notices that the export packets are not reaching the collector. The collector is reachable via ICMP. What is the most likely cause?
Explanation: NetFlow export uses UDP as the transport protocol, and the collector must be listening on the correct UDP port. Option A is correct because the export destination must specify the correct UDP port. Option B is incorrect because NetFlow does not require TCP. Option C is incorrect because the flow monitor is needed for Flexible NetFlow, but traditional NetFlow uses 'ip flow-export'. Option D is incorrect because the timeout setting affects when flows are exported, not the reachability of export packets.
A service provider is using Cisco ASR 9000 routers and needs to collect NetFlow data from multiple customers' traffic. The engineer wants to ensure that flow records from different customers are not mixed and can be identified separately. The router supports Flexible NetFlow. What is the best approach?
Explanation: Flexible NetFlow allows customization of flow records. Option A is correct by using a flow record with a 'match ipv4 vlan' or 'match ipv4 vrf' field to tag flows per customer. Option B is incorrect because separate flow monitors for each interface would still mix flows if multiple customers share an interface. Option C is incorrect because NetFlow v9 export format does not inherently separate customers. Option D is incorrect because SNMP is not suitable for per-customer flow identification.
A network operations center (NOC) is deploying streaming telemetry from Cisco IOS-XE devices to a Kafka-based analytics platform. The engineer needs to ensure that the telemetry data is encoded in a compact, efficient format for high-volume streaming. Which encoding format should the engineer configure?
Explanation: For high-volume streaming telemetry, efficient encoding is critical. Option A is correct because GPB (Google Protocol Buffers) is a compact binary format that reduces bandwidth and parsing overhead. Option B is incorrect because JSON is text-based and verbose. Option C is incorrect because XML is even more verbose. Option D is incorrect because CSV is not a standard telemetry encoding and lacks structure.
+15 more NetFlow and Telemetry questions available
Practice all NetFlow and Telemetry questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of NetFlow and Telemetry. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
NetFlow and Telemetry questions on the 350-401 frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. NetFlow and Telemetry is tested as part of the ENCOR 350-401 blueprint. Practicing with targeted NetFlow and Telemetry questions ensures you can handle any format or difficulty that appears.
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Difficulty is subjective, but NetFlow and Telemetry is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
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