350-601 Automation Practice Question
Exhibit
GET /ins HTTP/1.1\nHost: 10.1.1.1\nContent-Type: application/json\n\n{\n "ins_api": {\n "version": "1.0",\n "type": "cli_show",\n "chunk": "0",\n "sid": "1",\n "input": "show interface eth1/1"\n }\n}\n\nResponse:\n{\n "ins_api": {\n "outputs": {\n "output": {\n "msg": "Success",\n "code": "200",\n "input": "show interface eth1/1",\n "body": {
"TABLE_interface": { ... },
"ROW_interface": { "interface": "Ethernet1/1", "state": "up" }
}\n }\n }\n }\n}Refer to the exhibit. A Python script is processing the response from NX-API. It attempts to extract the interface state using `response['ins_api']['outputs']['output']['body']['ROW_interface']['state']` but receives a KeyError. What is the most likely reason?
⚠ Common exam trap
Many exam-takers assume the JSON path directly mirrors the CLI output structure, forgetting that NX-API wraps tabular data in an intermediate 'TABLE_' key that must be included in the dictionary traversal.
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
✓
The JSON structure has an extra level 'TABLE_interface' before 'ROW_interface'.
The NX-API response for interface commands includes a 'TABLE_interface' key that wraps the 'ROW_interface' key. The script attempts to access 'ROW_interface' directly under 'body', but the correct path is `response['ins_api']['outputs']['output']['body']['TABLE_interface']['ROW_interface']['state']`. Option B correctly identifies this missing intermediate level.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The 'output' key is a list, not a dictionary.
Why it's wrong here
In this response 'output' appears as a single object, not a list.
- ✓
The JSON structure has an extra level 'TABLE_interface' before 'ROW_interface'.
Why this is correct
Some NX-API outputs wrap rows in a table key; the script missed that level.
- ✗
The 'ins_api' key is nested inside another object.
Why it's wrong here
The top-level key is 'ins_api' as shown.
- ✗
The 'body' key is missing because the command failed.
Why it's wrong here
The response shows 'Success' and body is present.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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