The correct interpretation is that the interface has received 1,000,000 bytes and transmitted 500,000 bytes, as the in-octets and out-octets fields represent raw byte counters since the last discontinuity-time. This is because RESTCONF returns YANG-modeled data in JSON format, where the ietf-interfaces:statistics container exposes these counters directly from the IOS-XE device’s operational state. On the ENCOR 350-401 exam, this tests your ability to read RESTCONF responses and understand that octets are bytes, not packets—a common trap where candidates mistakenly interpret them as packet counts. The discontinuity-time field is critical, as it marks when the counters reset (e.g., after a device reboot or interface flap), so you must compare values against that timestamp for accurate utilization calculations. Memory tip: “Octets are bytes, not packets—think of the ‘O’ in octets as standing for ‘Overall bytes’ to avoid the trap.”
350-401 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.
A developer sends a RESTCONF request to retrieve interface statistics from a Cisco IOS-XE device:
Request:
```
GET /restconf/data/ietf-interfaces:interfaces/interface=GigabitEthernet1/statistics HTTP/1.1
Host: 192.168.1.1
Accept: application/yang-data+json
```
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The response indicates the interface has 1,000,000 bytes received and 500,000 bytes transmitted.
The response shows the statistics for the interface, including in-octets and out-octets. The data is in JSON format with the namespace prefix 'ietf-interfaces:'. The engineer can use this data to monitor interface utilization.
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.
✓
The response indicates the interface has 1,000,000 bytes received and 500,000 bytes transmitted.
Why this is correct
in-octets is received bytes, out-octets is transmitted bytes.
Related concept
Read the scenario before looking for a memorised answer.
✗
The response shows the interface has 1,000,000 packets received and 500,000 packets transmitted.
Why it's wrong here
The fields are in-octets and out-octets, which count bytes, not packets.
✗
The response indicates the interface has errors, so it is malfunctioning.
Why it's wrong here
in-errors and out-errors are both 0, indicating no errors.
✗
The response is invalid because the namespace should be 'ietf-interfaces:interfaces-state'.
Why it's wrong here
The namespace 'ietf-interfaces' is correct for the interfaces model.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 350-401 question in full detail.
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 — 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: The response indicates the interface has 1,000,000 bytes received and 500,000 bytes transmitted. — The response shows the statistics for the interface, including in-octets and out-octets. The data is in JSON format with the namespace prefix 'ietf-interfaces:'. The engineer can use this data to monitor interface utilization.
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.
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