This 200-901 practice question tests your understanding of cisco platforms and development. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 wants to use Cisco Webex Teams API to send a message to a specific room. Which of the following request JSON body fields is required?
"toPersonId"
Why wrong: Used for direct messages to a person by ID.
"toPersonEmail"
Why wrong: Used for direct messages to a person.
"roomId"
Required to specify the target room.
"text"
Why wrong: Optional; a message can have a file without text.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
"roomId"
The Cisco Webex Teams API requires the 'roomId' field in the request body to identify the specific room where the message will be sent. Without this field, the API cannot determine the destination, and the request will fail with a 400 Bad Request error. The 'roomId' is a mandatory parameter for sending messages to a room, as documented in the Webex API reference.
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.
"toPersonId"
Why it's wrong here
Used for direct messages to a person by ID.
"toPersonEmail"
Why it's wrong here
Used for direct messages to a person.
"roomId"
Why this is correct
Required to specify the target room.
Related concept
Read the scenario before looking for a memorised answer.
"text"
Why it's wrong here
Optional; a message can have a file without text.
Common exam traps
Cisco often tests the distinction between room messages and direct messages, and the trap here is that candidates may assume 'text' is required because it is the most obvious content field, but the API allows messages without text (e.g., only a file), making 'roomId' the only truly required field for room-targeted messages.
Detailed technical explanation
The Webex Teams API uses a RESTful endpoint (POST /v1/messages) where the request body must include either 'roomId' for room messages or 'toPersonId'/'toPersonEmail' for direct messages. The 'roomId' is a UUID that uniquely identifies the room, and the API validates it against the authenticated user's accessible rooms. In real-world scenarios, developers often retrieve the 'roomId' via the GET /v1/rooms endpoint before sending messages, ensuring the target room exists and is accessible.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Cisco Platforms and Development — This question tests Cisco Platforms and Development — Read the scenario before looking for a memorised answer..
The correct answer is: "roomId" — The Cisco Webex Teams API requires the 'roomId' field in the request body to identify the specific room where the message will be sent. Without this field, the API cannot determine the destination, and the request will fail with a 400 Bad Request error. The 'roomId' is a mandatory parameter for sending messages to a room, as documented in the Webex API reference.
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 24, 2026
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