Question 543 of 2,015

Model-Driven Telemetry →mediumMultiple SelectObjective-mapped

Quick Answer

The correct answer is that periodic subscriptions stream data at a fixed interval defined by the sample-interval parameter, while dial-out subscriptions are initiated by the device pushing data to the collector. This distinction is fundamental to model-driven telemetry because telemetry subscription types determine how data flows between network devices and collectors. Periodic subscriptions send updates on a steady cadence, making them ideal for baseline monitoring, whereas on-change subscriptions trigger updates only when a specific value changes, reducing bandwidth for static metrics. Dial-in subscriptions, by contrast, require the collector to initiate the connection to the device, which can become a scalability bottleneck when managing many devices. On the ENCOR 350-401 exam, this topic tests your understanding of telemetry architecture and often appears in multiple-choice questions with a trap that conflates cadence with on-change subscriptions—remember that cadence is a property of periodic, not on-change. A helpful memory tip: think of dial-out as the device “shouting” data to the collector, while dial-in is the collector “knocking” on the device’s door.

350-401 Model-Driven Telemetry Practice Question

This 350-401 practice question tests your understanding of model-driven 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.

Which two statements about telemetry subscription types in model-driven telemetry are true? (Choose two.)

Question 1mediummulti select

Read the full network assurance explanation →

A
In a dial-in subscription, the network device initiates the connection to the telemetry collector.
Why wrong: Incorrect because in dial-in subscriptions, the collector initiates the connection to the device; the device acts as a server.
B
In a dial-out subscription, the network device pushes telemetry data to a configured collector.
Correct because dial-out subscriptions are device-initiated; the device connects to the collector and streams data.
C
On-change subscriptions stream data at a regular, user-defined cadence.
Why wrong: Incorrect because on-change subscriptions stream data only when a monitored value changes, not at a fixed cadence. Cadence is used by periodic subscriptions.
D
Periodic subscriptions stream data at a fixed interval, which is defined by the sample-interval parameter.
Correct because periodic subscriptions use a sample-interval (e.g., in milliseconds) to determine how often data is collected and streamed.
E
Dial-out subscriptions are less scalable than dial-in subscriptions because each device must manage its own connections.
Why wrong: Incorrect because dial-out is generally more scalable; the device pushes data to a collector, reducing the collector's burden of managing many inbound connections.

Full breakdown with real-world context →

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

✓

In a dial-out subscription, the network device pushes telemetry data to a configured collector.

Dial-in subscriptions are initiated by the collector connecting to the device, while dial-out subscriptions are initiated by the device pushing data to the collector. Periodic subscriptions stream data at fixed intervals, and on-change subscriptions stream data only when a value changes. Cadence is a property of periodic subscriptions, not on-change. Dial-out is more scalable for many devices because the device manages connections.

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.

✗
In a dial-in subscription, the network device initiates the connection to the telemetry collector.
Why it's wrong here
Incorrect because in dial-in subscriptions, the collector initiates the connection to the device; the device acts as a server.
✓
In a dial-out subscription, the network device pushes telemetry data to a configured collector.
Why this is correct
Correct because dial-out subscriptions are device-initiated; the device connects to the collector and streams data.
Related concept
Read the scenario before looking for a memorised answer.
✗
On-change subscriptions stream data at a regular, user-defined cadence.
Why it's wrong here
Incorrect because on-change subscriptions stream data only when a monitored value changes, not at a fixed cadence. Cadence is used by periodic subscriptions.
✓
Periodic subscriptions stream data at a fixed interval, which is defined by the sample-interval parameter.
Why this is correct
Correct because periodic subscriptions use a sample-interval (e.g., in milliseconds) to determine how often data is collected and streamed.
Related concept
Read the scenario before looking for a memorised answer.
✗
Dial-out subscriptions are less scalable than dial-in subscriptions because each device must manage its own connections.
Why it's wrong here
Incorrect because dial-out is generally more scalable; the device pushes data to a collector, reducing the collector's burden of managing many inbound connections.

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.

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 350-401 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 350-401 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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FAQ

Questions learners often ask

What does this 350-401 question test?

Model-Driven Telemetry — This question tests Model-Driven Telemetry — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: In a dial-out subscription, the network device pushes telemetry data to a configured collector. — Dial-in subscriptions are initiated by the collector connecting to the device, while dial-out subscriptions are initiated by the device pushing data to the collector. Periodic subscriptions stream data at fixed intervals, and on-change subscriptions stream data only when a value changes. Cadence is a property of periodic subscriptions, not on-change. Dial-out is more scalable for many devices because the device manages connections.

What should I do if I get this 350-401 question wrong?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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Same concept, more angles

1 more ways this is tested on 350-401

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. Which two statements about telemetry subscription modes are true? (Choose two.)

medium

✓ A.In dial-out mode, the network device initiates a connection to the telemetry collector.
✓ B.In dial-in mode, the collector subscribes to data by connecting to the network device.
C.gRPC supports only dial-out telemetry subscriptions.
D.NETCONF is exclusively used for dial-in telemetry subscriptions.
E.SNMP traps are a form of dial-out telemetry.

Why A: Dial-out mode pushes data from the network device to a collector, while dial-in mode requires the collector to initiate the connection. gRPC supports both modes. NETCONF can also support both but is not limited to dial-in. SNMP is a polling-based protocol, not a telemetry subscription mode.

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