200-901 Understanding and Using APIs Practice Question
In a RESTCONF API call to retrieve a specific interface configuration on a Cisco device, an engineer sends a GET request to /restconf/data/interfaces/interface=GigabitEthernet0/1. What Content-Type should be specified in the Accept header to receive YANG-defined JSON?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
application/yang-data+json
RESTCONF uses application/yang-data+json for JSON encoding of YANG data.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
text/plain
Why it's wrong here
text/plain is not a RESTCONF media type for YANG data; the server cannot return structured JSON under it. The Accept header must specify the JSON media type. text/plain would be correct for retrieving unstructured plain-text output, such as a raw device banner.
- ✗
application/xml
Why it's wrong here
application/xml requests XML-encoded YANG data, which RESTCONF returns only when JSON is not requested. The Accept header must name the JSON media type to receive YANG-defined JSON. XML would be correct if the client needed XML-encoded configuration data instead.
- ✓
application/yang-data+json
Why this is correct
RESTCONF encodes YANG-modelled data, and the Accept header must request the YANG media type. application/yang-data+json returns the interface configuration as YANG-defined JSON, matching the stem's requirement, whereas application/json alone is not the registered RESTCONF media type.
- ✗
application/json
Why it's wrong here
Not specific to YANG.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.