- A
gRPC uses HTTP/2 as its transport protocol and Protocol Buffers as its interface definition language.
Correct because gRPC is built on HTTP/2 for multiplexed, low-latency communication and uses Protocol Buffers for serialization and service definition.
- B
gNMI (gRPC Network Management Interface) is a gRPC-based protocol that can be used for both telemetry and configuration operations.
Correct because gNMI defines RPCs for Subscribe (telemetry), Get, Set, and Capabilities, making it suitable for both monitoring and configuration.
- C
gNMI telemetry subscriptions can only use YANG paths from OpenConfig models.
Why wrong: Incorrect because gNMI can use any YANG model path—native, OpenConfig, or IETF—as long as the device supports it.
- D
gNMI relies on NETCONF for session establishment and data encoding.
Why wrong: Incorrect because gNMI is independent of NETCONF; it uses gRPC (HTTP/2) for transport and Protocol Buffers for encoding, not NETCONF's XML-based encoding.
- E
gNMI supports both periodic and on-change telemetry subscriptions.
Correct because gNMI's Subscribe RPC allows specifying a subscription mode of SAMPLE (periodic) or ON_CHANGE.
Quick Answer
The correct answer is that gNMI supports both periodic and on-change telemetry subscriptions, making it a cornerstone of model-driven telemetry. This is because gNMI, or gRPC Network Management Interface, is built on top of gRPC, which uses HTTP/2 for transport and Protocol Buffers for efficient serialization, enabling real-time streaming of structured data. Unlike older polling methods, gNMI’s Subscribe RPC allows network devices to push data at scheduled intervals or immediately upon a state change, which is critical for modern network automation. On the ENCOR 350-401 exam, this concept tests your understanding of how model-driven telemetry differs from traditional SNMP-based monitoring; a common trap is confusing gNMI with NETCONF, but remember that gNMI operates independently over gRPC and does not require NETCONF at all. A useful memory tip is to think of “gNMI” as the “gRPC Navigator for Model-driven Intelligence”—it navigates YANG data models to deliver telemetry on your terms, whether periodic or on-change.
CCNP Model-Driven Telemetry Practice Question
This 350-401 practice question tests your understanding of model-driven telemetry. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 three statements about gRPC and gNMI in the context of model-driven telemetry are true? (Choose three.)
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
gRPC uses HTTP/2 as its transport protocol and Protocol Buffers as its interface definition language.
gRPC uses HTTP/2 for transport and Protocol Buffers for serialization. gNMI is a gRPC-based protocol specifically for network management and telemetry. gNMI supports both telemetry subscriptions (Subscribe RPC) and configuration operations (Set, Get). It uses YANG models to define data paths. gNMI does not require NETCONF; it operates independently over gRPC.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
gRPC uses HTTP/2 as its transport protocol and Protocol Buffers as its interface definition language.
- ✓
gNMI (gRPC Network Management Interface) is a gRPC-based protocol that can be used for both telemetry and configuration operations.
Why this is correct
Correct because gNMI defines RPCs for Subscribe (telemetry), Get, Set, and Capabilities, making it suitable for both monitoring and configuration.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
gNMI telemetry subscriptions can only use YANG paths from OpenConfig models.
Why it's wrong here
Incorrect because gNMI can use any YANG model path—native, OpenConfig, or IETF—as long as the device supports it.
- ✗
gNMI relies on NETCONF for session establishment and data encoding.
Why it's wrong here
Incorrect because gNMI is independent of NETCONF; it uses gRPC (HTTP/2) for transport and Protocol Buffers for encoding, not NETCONF's XML-based encoding.
- ✓
gNMI supports both periodic and on-change telemetry subscriptions.
Why this is correct
Correct because gNMI's Subscribe RPC allows specifying a subscription mode of SAMPLE (periodic) or ON_CHANGE.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
- →
Model-Driven Telemetry — study guide chapter
Learn the concepts, then practise the questions
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Model-Driven Telemetry practice questions
Targeted practice on this topic area only
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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 — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: gRPC uses HTTP/2 as its transport protocol and Protocol Buffers as its interface definition language. — gRPC uses HTTP/2 for transport and Protocol Buffers for serialization. gNMI is a gRPC-based protocol specifically for network management and telemetry. gNMI supports both telemetry subscriptions (Subscribe RPC) and configuration operations (Set, Get). It uses YANG models to define data paths. gNMI does not require NETCONF; it operates independently over gRPC.
What should I do if I get this 350-401 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 18, 2026
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.
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