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200-901 Practice Question: A Python script uses the `requests` library to…

A Python script uses the `requests` library to fetch device details from Cisco DNA Center. The API returns a JSON response with nested objects. To extract the management IP address from the response stored in variable `data`, which code snippet is correct? The JSON structure is:

{
  "response": [
    {
      "managementIpAddress": "192.168.1.1",
      "hostname": "router1"
    }
  ]
}

Answer choices

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Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

data['response'][0]['managementIpAddress']

The response contains a list under key 'response'; correct access is via data['response'][0]['managementIpAddress'].

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
data.managementIpAddress
Why it's wrong here
Accessing `data.managementIpAddress` treats the parsed JSON as an object with attributes, but `requests` returns dictionaries and lists, so the key sits at `data["response"][0]["managementIpAddress"]`. Attribute access suits libraries like `xmltodict` or custom objects; here it raises `AttributeError`.
✗
data['response']['managementIpAddress']
Why it's wrong here
Indexing `data['response']` yields a list, so subscripting it with the string `'managementIpAddress'` raises a `TypeError`; the list element must be selected first, as in `data['response'][0]['managementIpAddress']`. Chained key access suits JSON where each level is an object, not an array, which this response is not.
✗
data.get('response')[0].get('managementIpAddress')
Why it's wrong here
Bracket indexing is required: data['response'] returns the list, then [0]['managementIpAddress'] extracts the nested value. The .get() method returns None for missing keys rather than raising KeyError, which is why it is preferred for optional fields — but here the keys exist and .get() on a list element still needs the index, so the syntax is valid only if response is guaranteed present.
✓
data['response'][0]['managementIpAddress']
Why this is correct
Accessing `data['response']` yields the JSON array, and `[0]` selects its first element, the device object. Indexing that dictionary with `['managementIpAddress']` returns the nested string "192.168.1.1". This directly satisfies the stem's requirement to extract the management IP from the nested structure.

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200-901 Practice Question: A Python script uses the `requests` library to…

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