Quick Answer
The correct answer is `sites = response['response']`. This is the proper way to extract the list of sites from a Cisco Catalyst Center API JSON response because the API wraps its data payload inside a top-level key literally named `"response"`. When you use Python’s `requests` library and call `.json()`, the result is a Python dictionary, so you access nested data using standard dictionary indexing—`response['response']` retrieves the list directly. On the DevNet Associate 200-901 exam, this tests your understanding of how Catalyst Center structures its API output; a common trap is confusing the outer `response` variable with the inner `'response'` key, or trying methods like `.get('response')` which also works but is less direct. The exam often presents similar scenarios where you must distinguish between the HTTP response object and the JSON body’s keys. Memory tip: think of it as “the response’s response”—the outer variable holds the parsed JSON, and the inner `'response'` key holds the actual data you need.
This 200-901 practice question tests your understanding of software development and design. 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 is writing a Python script that uses the Cisco Catalyst Center (formerly DNA Center) API to get the list of sites. The API returns a response with a 'response' key containing a list of sites. The developer wants to access the 'response' field from the JSON response. Which code snippet correctly extracts the list?
sites = list(response)
Why wrong: Incorrect: This would convert the dict keys to a list.
sites = response['response']
Correct: Accessing the key 'response' returns the list.
sites = response[0]
Why wrong: Incorrect: The response is a dict, not a list.
sites = response.get('response')
Why wrong: Incorrect: This returns the value, but it is still a list; however, the question asks for the correct extraction.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
sites = response['response']
Option B is correct because the Cisco Catalyst Center API returns a JSON response where the list of sites is nested under the 'response' key. Using dictionary-style indexing with `response['response']` directly retrieves that list, which is the standard way to access a known key in a Python dictionary parsed from JSON.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
sites = list(response)
Why it's wrong here
Incorrect: This would convert the dict keys to a list.
sites = response['response']
Why this is correct
Correct: Accessing the key 'response' returns the list.
Related concept
Read the scenario before looking for a memorised answer.
sites = response[0]
Why it's wrong here
Incorrect: The response is a dict, not a list.
sites = response.get('response')
Why it's wrong here
Incorrect: This returns the value, but it is still a list; however, the question asks for the correct extraction.
Common exam traps
Cisco often tests whether candidates understand that API responses are parsed into dictionaries, not lists, and that the 'response' key is a nested structure; the trap here is confusing the outer dictionary with the inner list, leading candidates to pick `response[0]` or `list(response)`.
Detailed technical explanation
When the Cisco Catalyst Center API returns a JSON payload, the `requests` library's `.json()` method parses it into a Python dictionary. The 'response' key often contains a list of objects (e.g., sites), and accessing it via `response['response']` is the direct method. Using `.get()` is a safer alternative that avoids KeyError if the key is missing, but the exam expects the explicit indexing syntax for this specific question.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Software Development and Design — This question tests Software Development and Design — Read the scenario before looking for a memorised answer..
The correct answer is: sites = response['response'] — Option B is correct because the Cisco Catalyst Center API returns a JSON response where the list of sites is nested under the 'response' key. Using dictionary-style indexing with `response['response']` directly retrieves that list, which is the standard way to access a known key in a Python dictionary parsed from JSON.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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