Question 349 of 500

Automation →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the JSON payload must include the required 'ins_api' wrapper with version and type fields. NX-API on Nexus switches enforces a strict JSON structure for all POST requests; without this wrapper, the API cannot interpret the CLI command, resulting in an HTTP 400 error. This concept is frequently tested on the Cisco DCCOR 350-601 exam, where engineers must understand that the payload must contain the 'ins_api' object with parameters like version (e.g., "1.0"), type (e.g., "cli_show"), chunk, sid, and input. A common trap is assuming a flat JSON with just the CLI command is sufficient, but NX-API requires this nested structure for security and parsing. Remember the mnemonic "VTCSI" — Version, Type, Chunk, Sid, Input — to ensure your NX-API JSON payload structure is complete and avoids the dreaded 400 error.

350-601 Automation Practice Question

This 350-601 practice question tests your understanding of automation. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 network engineer is automating a repetitive configuration task on a Nexus 9000 switch using Python scripts with NX-API. The script sends a CLI command via POST request but receives HTTP 400 status with error 'Invalid request payload'. What is the most likely cause?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Question 1mediummultiple choice

Study the full Python automation breakdown →

A
The JSON payload does not include the required 'ins_api' wrapper with version and type fields.
The NX-API requires a specific JSON format with 'ins_api' envelope containing attributes like version, type, chunk, sid, and input.
B
The switch is running an unsupported NX-OS version.
Why wrong: NX-API is supported on most modern NX-OS versions; version mismatch does not typically cause 'Invalid request payload'.
C
The script is using HTTP instead of HTTPS.
Why wrong: Using HTTP vs HTTPS would affect the connection but not cause a 400 status; it would be a connection or certificate error.
D
The CLI command syntax is incorrect with too many spaces.
Why wrong: Incorrect CLI syntax would generate a different error (e.g., status 200 with error output in response body), not 'Invalid request payload'.

Full breakdown with real-world context →

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 payload does not include the required 'ins_api' wrapper with version and type fields.

The NX-API expects a specific JSON structure. Option B correctly identifies that the payload must include 'ins_api' wrapper with version, type, chunk, sid, input parameters.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

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 JSON payload does not include the required 'ins_api' wrapper with version and type fields.
Why this is correct
The NX-API requires a specific JSON format with 'ins_api' envelope containing attributes like version, type, chunk, sid, and input.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The switch is running an unsupported NX-OS version.
Why it's wrong here
NX-API is supported on most modern NX-OS versions; version mismatch does not typically cause 'Invalid request payload'.
✗
The script is using HTTP instead of HTTPS.
Why it's wrong here
Using HTTP vs HTTPS would affect the connection but not cause a 400 status; it would be a connection or certificate error.
✗
The CLI command syntax is incorrect with too many spaces.
Why it's wrong here
Incorrect CLI syntax would generate a different error (e.g., status 200 with error output in response body), not 'Invalid request payload'.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Trap categories for this question

Command / output trap
Incorrect CLI syntax would generate a different error (e.g., status 200 with error output in response body), not 'Invalid request payload'.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the 350-601 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

Got this wrong? Here's your next step.

Identify which 350-601 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this 350-601 question test?

Automation — This question tests Automation — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The JSON payload does not include the required 'ins_api' wrapper with version and type fields. — The NX-API expects a specific JSON structure. Option B correctly identifies that the payload must include 'ins_api' wrapper with version, type, chunk, sid, input parameters.

What should I do if I get this 350-601 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 24, 2026

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