- A
Configure model-driven telemetry (MDT) using gRPC or gNMI to subscribe to the desired YANG data models for interface counters and BGP state.
Correct because MDT with gRPC/gNMI provides scalable, real-time streaming of structured data from NX-OS devices.
- B
Enable NetFlow v9 on the switches and configure the collector to receive flow records that include interface statistics.
Why wrong: Incorrect because NetFlow is designed for flow-level traffic data, not for streaming interface counters or BGP state changes.
- C
Use SNMP traps to send interface and BGP state changes to the collector.
Why wrong: Incorrect because SNMP traps are event-driven but lack the scalability and granularity for high-frequency streaming of counters.
- D
Deploy IP SLA responders on the switches to measure performance and send results via syslog.
Why wrong: Incorrect because IP SLA is for active performance measurements, not for streaming device state information.
Quick Answer
The correct answer is model-driven telemetry (MDT) using gRPC or gNMI, because this technology directly subscribes to YANG data models on NX-OS to stream structured interface counters and BGP neighbor state changes in real time. Unlike SNMP’s pull-based polling or trap-driven model, MDT pushes data either periodically or on-change, offering the scalability and low-latency visibility that a large enterprise requires for migration from SNMP. On the ENCOR 350-401 exam, this question tests your understanding of streaming telemetry as a core network assurance topic, often appearing alongside traps about NetFlow (which handles flow records, not interface state) or IP SLA (which measures synthetic traffic). A common trap is confusing event-driven SNMP traps with MDT’s on-change subscriptions—remember that SNMP traps lack the structured, high-frequency push capability of gRPC/gNMI. Memory tip: “MDT pushes YANG; SNMP pulls OIDs.”
350-401 NetFlow and Telemetry Practice Question
This 350-401 practice question tests your understanding of netflow and telemetry. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
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?
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
Configure model-driven telemetry (MDT) using gRPC or gNMI to subscribe to the desired YANG data models for interface counters and BGP state.
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.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Configure model-driven telemetry (MDT) using gRPC or gNMI to subscribe to the desired YANG data models for interface counters and BGP state.
Why this is correct
Correct because MDT with gRPC/gNMI provides scalable, real-time streaming of structured data from NX-OS devices.
Related concept
OSPF neighbours must agree on key parameters.
- ✗
Enable NetFlow v9 on the switches and configure the collector to receive flow records that include interface statistics.
Why it's wrong here
Incorrect because NetFlow is designed for flow-level traffic data, not for streaming interface counters or BGP state changes.
- ✗
Use SNMP traps to send interface and BGP state changes to the collector.
Why it's wrong here
Incorrect because SNMP traps are event-driven but lack the scalability and granularity for high-frequency streaming of counters.
- ✗
Deploy IP SLA responders on the switches to measure performance and send results via syslog.
Why it's wrong here
Incorrect because IP SLA is for active performance measurements, not for streaming device state information.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
Real-world example
How this comes up in practice
A network engineer at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
What to study next
Got this wrong? Here's your next step.
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-401 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this 350-401 question test?
NetFlow and Telemetry — This question tests NetFlow and Telemetry — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Configure model-driven telemetry (MDT) using gRPC or gNMI to subscribe to the desired YANG data models for interface counters and BGP state. — 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.
What should I do if I get this 350-401 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related 350-401 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 18, 2026
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