350-501 Automation and Assurance Practice Question
A network architect is designing a model-driven telemetry solution for a large SP network. Which three factors are critical to consider when configuring telemetry subscriptions? (Choose three.)
⚠ Common exam trap
Cisco often tests the distinction between factors that are critical for subscription configuration versus those that are important for overall telemetry deployment but not directly part of the subscription setup, leading candidates to mistakenly select encoding format or YANG model size.
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 collection protocol (gRPC vs gNMI vs native TCP).
The collection protocol (gRPC, gNMI, or native TCP) is critical because it determines the transport mechanism, security model, and compatibility with the telemetry collector. gRPC offers high-performance streaming with TLS, gNMI provides a standardized interface for both telemetry and configuration, and native TCP is simpler but less flexible. Choosing the wrong protocol can lead to interoperability issues or performance bottlenecks in a large SP network.
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 size of the YANG data model.
Why it's wrong here
Model size is determined by the standard and is not configurable in subscriptions; it affects the amount of data per update but is not a factor in configuring subscriptions.
- ✓
The collection protocol (gRPC vs gNMI vs native TCP).
Why this is correct
The protocol determines capabilities like on-change reporting, encoding, and transport efficiency.
- ✓
Network bandwidth to the telemetry collector.
Why this is correct
Bandwidth must be sufficient to handle the telemetry data rate to avoid congestion and loss.
- ✓
The sampling interval for periodic subscriptions.
Why this is correct
The interval directly impacts data volume and the ability to capture events of interest.
- ✗
The encoding format (GPB, JSON, XML).
Why it's wrong here
Encoding format affects parsing overhead and bandwidth but is secondary to the critical factors listed.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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