- A
Google Protocol Buffers (GPB) provide a compact, binary encoding that reduces bandwidth usage.
Correct because GPB is efficient and commonly used in high-performance telemetry.
- B
JSON encoding is human-readable and supported by both gRPC and RESTCONF telemetry.
Correct because JSON is easy to parse and widely adopted in telemetry systems.
- C
XML encoding is verbose but is the default for NETCONF-based telemetry subscriptions.
Correct because XML is the native encoding for NETCONF, though it adds overhead.
- D
YANG defines the encoding format for telemetry data.
Why wrong: Incorrect because YANG models data structure, not encoding; encoding is separate (e.g., JSON, XML).
- E
CBOR is a binary encoding format used exclusively in Cisco IOS-XE telemetry.
Why wrong: Incorrect because CBOR is not a standard encoding for Cisco telemetry; GPB and JSON are preferred.
Quick Answer
The answer is that XML encoding is verbose but is the default for NETCONF-based telemetry subscriptions. This is correct because model-driven telemetry relies on encoding formats to serialize structured data defined by YANG models, and each format serves a distinct purpose: GPB (Google Protocol Buffers) is compact and efficient, making it ideal for high-performance gRPC streams, while JSON offers human readability and broad API support, and XML, though verbose, remains the standard for NETCONF due to its native integration with that protocol. On the ENCOR 350-401 exam, this question tests your ability to distinguish encoding from data modeling—a common trap is confusing YANG (which defines data structure, not encoding) with the actual wire formats. Remember that GPB prioritizes speed, JSON balances readability and size, and XML is the verbose but required default for NETCONF subscriptions. A useful memory tip: “GPB for gRPC speed, JSON for web ease, XML for NETCONF’s legacy.”
CCNP 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 three statements about encoding formats in 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
Google Protocol Buffers (GPB) provide a compact, binary encoding that reduces bandwidth usage.
GPB is compact and efficient, often used with gRPC. JSON is human-readable and widely supported. XML is verbose but used in NETCONF. YANG does not define encoding; it defines data models. CBOR is not commonly used in Cisco telemetry.
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.
- ✓
Google Protocol Buffers (GPB) provide a compact, binary encoding that reduces bandwidth usage.
Why this is correct
Correct because GPB is efficient and commonly used in high-performance telemetry.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
JSON encoding is human-readable and supported by both gRPC and RESTCONF telemetry.
Why this is correct
Correct because JSON is easy to parse and widely adopted in telemetry systems.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
XML encoding is verbose but is the default for NETCONF-based telemetry subscriptions.
Why this is correct
Correct because XML is the native encoding for NETCONF, though it adds overhead.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
YANG defines the encoding format for telemetry data.
Why it's wrong here
Incorrect because YANG models data structure, not encoding; encoding is separate (e.g., JSON, XML).
- ✗
CBOR is a binary encoding format used exclusively in Cisco IOS-XE telemetry.
Why it's wrong here
Incorrect because CBOR is not a standard encoding for Cisco telemetry; GPB and JSON are preferred.
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.
- →
Model-Driven Telemetry — study guide chapter
Learn the concepts, then practise the questions
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Model-Driven Telemetry practice questions
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ENCOR 350-401 study guide
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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: Google Protocol Buffers (GPB) provide a compact, binary encoding that reduces bandwidth usage. — GPB is compact and efficient, often used with gRPC. JSON is human-readable and widely supported. XML is verbose but used in NETCONF. YANG does not define encoding; it defines data models. CBOR is not commonly used in Cisco telemetry.
What should I do if I get this 350-401 question wrong?
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.
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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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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