The correct answer is that the request succeeds and the interface configuration remains unchanged. This outcome is due to the idempotent behavior of the RESTCONF PUT operation, which replaces the target resource with the provided payload exactly as specified. When the existing configuration for GigabitEthernet1/0/1 already matches the JSON payload—here, the IP address 10.10.10.1/24—the PUT request applies the same data, resulting in no net change to the device state. On the Cisco DevNet Associate 200-901 exam, this scenario tests your understanding that PUT is idempotent, meaning multiple identical requests produce the same result as a single request, unlike POST which is non-idempotent. A common trap is assuming a mismatch or error occurs when the config already exists, but RESTCONF treats a matching PUT as a successful no-op. Remember the memory tip: "PUT matches, no patch—same data, same state."
200-901 Cisco Platforms and Development Practice Question
This 200-901 practice question tests your understanding of cisco platforms and development. 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.
Refer to the exhibit. A developer sends a PUT request to the RESTCONF endpoint with the above JSON payload. The device already has interface GigabitEthernet1/0/1 configured with IP address 10.10.10.1/24. What is the expected outcome?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The request succeeds and the interface configuration remains unchanged.
D is correct because the PUT request to the RESTCONF endpoint with the provided JSON payload is an idempotent operation. Since the interface GigabitEthernet1/0/1 already exists with the exact same configuration (IP address 10.10.10.1/24), the PUT request effectively replaces the resource with the same data, resulting in no change. RESTCONF uses the HTTP PUT method to create or replace a resource, and if the resource already exists and the payload matches, the operation succeeds without modification.
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 request fails because the interface already exists.
Why it's wrong here
PUT is idempotent; it can replace existing resources.
✗
The request creates a new interface with the same configuration.
Why it's wrong here
PUT targets a specific resource; it does not create a new one if the URI identifies an existing resource.
The request succeeds and the interface configuration remains unchanged.
Why this is correct
PUT replaces the resource with the given data; since it matches, no change occurs but the operation succeeds.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that PUT will fail or create a duplicate resource when the target already exists, but the correct behavior is that PUT replaces the resource idempotently, and if the data is identical, the configuration remains unchanged.
Detailed technical explanation
How to think about this question
RESTCONF, defined in RFC 8040, uses HTTP methods to manipulate YANG-defined data stores. The PUT method is used to create or replace the target resource entirely; if the resource exists, it is replaced with the request body. In this scenario, the device's operational state is compared against the payload, and since they match, the NETCONF datastore (candidate or running) is not modified, and the server returns a 204 No Content or 200 OK response. This behavior is distinct from PATCH, which performs a partial update, and POST, which creates a new child resource.
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.
TExam Day Tips
→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 200-901 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Cisco Platforms and Development — This question tests Cisco Platforms and Development — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The request succeeds and the interface configuration remains unchanged. — D is correct because the PUT request to the RESTCONF endpoint with the provided JSON payload is an idempotent operation. Since the interface GigabitEthernet1/0/1 already exists with the exact same configuration (IP address 10.10.10.1/24), the PUT request effectively replaces the resource with the same data, resulting in no change. RESTCONF uses the HTTP PUT method to create or replace a resource, and if the resource already exists and the payload matches, the operation succeeds without modification.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This 200-901 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 200-901 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.