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CCNP Practice Question: Which two statements about telemetry subscription…
Which two statements about telemetry subscription types in model-driven telemetry are true? (Choose two.)
⚠ Common exam trap
350-401 often tests the direction of connection initiation in dial-in vs. dial-out, where candidates might confuse which side initiates the connection.
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.
Option B is correct because in a dial-out (also called push) subscription the network device itself initiates the session and pushes telemetry data to a preconfigured collector address, rather than waiting for the collector to connect. Option D is correct because periodic subscriptions send updates at a fixed, user-defined interval controlled by the sample-interval parameter, delivering data continuously regardless of whether values changed. Option A is incorrect because in a dial-in subscription it is the collector (receiver) that initiates the connection to the device, not the device. Option C is incorrect because on-change subscriptions stream data only when a monitored value changes, not at a regular cadence. Option E is incorrect because dial-out is generally considered more scalable for large deployments, since the collector passively receives streams and does not have to poll or maintain a session per device.
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
Dial-in subscriptions reverse this: the collector connects to the device, which listens and streams telemetry to it. Dial-out is the mode where the device initiates the session. Dial-in is tempting because the term suggests the device dials out, and it would be correct if the stem described the collector as the initiator.
- ✓
In a dial-out subscription, the network device pushes telemetry data to a configured collector.
Why this is correct
Dial-out subscriptions invert the usual model: the router or switch initiates the session and pushes telemetry to a preconfigured collector, rather than awaiting a receiver's request. This matches the stem's requirement for a true statement about subscription types.
- ✗
On-change subscriptions stream data at a regular, user-defined cadence.
Why it's wrong here
On-change subscriptions publish only when a monitored value changes, not at a fixed cadence; periodic subscriptions stream at the user-defined interval. On-change is tempting because both are subscription types configured on the same device, and it would be the right answer if the stem described event-triggered rather than timer-driven updates.
- ✓
Periodic subscriptions stream data at a fixed interval, which is defined by the sample-interval parameter.
Why this is correct
Periodic subscriptions operate on a timer, streaming telemetry every sample-interval seconds regardless of change, unlike on-change subscriptions that publish only on events. This precisely satisfies the stem's requirement for a true statement about subscription types.
- ✗
Dial-out subscriptions are less scalable than dial-in subscriptions because each device must manage its own connections.
Why it's wrong here
Dial-out is generally considered more scalable, since devices push to collectors and no inbound connections to each device are needed; the stated comparison is inverted. Dial-out is tempting because per-device connection management sounds burdensome, and it would be correct if the stem asked which mode suits large fleets behind firewalls.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
This 350-401 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 350-401 exam.