200-901 Understanding and Using APIs Practice Question
This 200-901 practice question tests your understanding of understanding and using apis. 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 Python script uses the Cisco Webex API to list all rooms. The response includes pagination via the 'Link' header with 'rel="next"'. What is the correct way to retrieve the next page of rooms?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Parse the 'Link' header for the URL with 'rel="next"' and send a GET request to that URL.
Option A is correct because the Webex API uses HTTP Link headers for pagination, as specified in RFC 5988. The 'Link' header contains a URL with 'rel="next"' that points directly to the next page of results. To retrieve the next page, you must parse this header, extract the URL, and send a GET request to that URL. This is the standard approach for cursor-based or token-based pagination, which is common in RESTful APIs that avoid offset-based pagination for consistency.
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.
✓
Parse the 'Link' header for the URL with 'rel="next"' and send a GET request to that URL.
Why this is correct
This is the correct method for cursor-based pagination.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increment a page counter and append '?page=2' to the original URL.
Why it's wrong here
Webex API uses cursor-based pagination, not page numbers; appending '?page=2' may not work.
✗
Use the total count returned in the response to calculate the offset.
Why it's wrong here
Offset-based pagination is not used; using total count may not yield correct results.
✗
Send a POST request to the same endpoint with the 'cursor' parameter.
Why it's wrong here
Retrieving data should use GET, not POST, and cursor is not passed as a parameter.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that pagination always uses simple page numbers or offsets, but the trap here is that the Webex API uses the Link header with 'rel="next"' for cursor-based pagination, and candidates may incorrectly assume a traditional page counter or offset approach.
Detailed technical explanation
How to think about this question
Under the hood, the Webex API implements cursor-based pagination using the Link header, which provides a stable pointer to the next page even if new rooms are added or removed between requests. This approach avoids the pitfalls of offset-based pagination, such as duplicate or missed records when data changes. In real-world scenarios, failing to parse the Link header can lead to incomplete data retrieval or infinite loops if the API changes its pagination strategy.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Understanding and Using APIs — This question tests Understanding and Using APIs — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Parse the 'Link' header for the URL with 'rel="next"' and send a GET request to that URL. — Option A is correct because the Webex API uses HTTP Link headers for pagination, as specified in RFC 5988. The 'Link' header contains a URL with 'rel="next"' that points directly to the next page of results. To retrieve the next page, you must parse this header, extract the URL, and send a GET request to that URL. This is the standard approach for cursor-based or token-based pagination, which is common in RESTful APIs that avoid offset-based pagination for consistency.
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.
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Question Discussion
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