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350-401 Practice Question: Which three statements about encoding formats in…
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.
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.
- ✓
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.
- ✓
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.
- ✗
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.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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