Question 1,874 of 2,015

REST APIs and Data Models →hardMultiple ChoiceObjective-mapped

CCNP REST APIs and Data Models Practice Question

This 350-401 practice question tests your understanding of rest apis and data models. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.

An engineer is using the Cisco SD-WAN vManage REST API to retrieve the list of WAN edge devices. The engineer sends a GET request to 'https://vmanage/dataservice/device' and receives a 401 Unauthorized error. The engineer has already obtained a JSESSIONID cookie by authenticating with the API. What is the most likely cause of the error?

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 1hardmultiple choice

Study the full SD-WAN breakdown →

A
The JSESSIONID cookie must be included in the request headers for authentication.
Correct because the session cookie must be sent with each request to maintain authentication.
B
The engineer must use a different authentication method, such as OAuth2, instead of cookies.
Why wrong: Incorrect because vManage supports cookie-based authentication; the issue is that the cookie is not being sent.
C
The URI is incorrect; the correct URI should be 'https://vmanage/dataservice/device/wanedge'.
Why wrong: Incorrect because the URI '/dataservice/device' is correct; a wrong URI would result in a 404 error.
D
The engineer must include a CSRF token in the request header for GET requests.
Why wrong: Incorrect because CSRF tokens are typically required for state-changing methods like POST, PUT, DELETE, not for GET.

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 JSESSIONID cookie must be included in the request headers for authentication.

A 401 error indicates that authentication is required or has failed. Even with a JSESSIONID cookie, the engineer must include it in the request headers. Additionally, vManage APIs often require a CSRF token for state-changing operations, but for GET requests, the JSESSIONID should suffice. The most likely cause is that the cookie is not being sent with the request, or the session has expired.

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 JSESSIONID cookie must be included in the request headers for authentication.
Why this is correct
Correct because the session cookie must be sent with each request to maintain authentication.
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 engineer must use a different authentication method, such as OAuth2, instead of cookies.
Why it's wrong here
Incorrect because vManage supports cookie-based authentication; the issue is that the cookie is not being sent.
✗
The URI is incorrect; the correct URI should be 'https://vmanage/dataservice/device/wanedge'.
Why it's wrong here
Incorrect because the URI '/dataservice/device' is correct; a wrong URI would result in a 404 error.
✗
The engineer must include a CSRF token in the request header for GET requests.
Why it's wrong here
Incorrect because CSRF tokens are typically required for state-changing methods like POST, PUT, DELETE, not for GET.

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.

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 350-401 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 350-401 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 350-401 question test?

REST APIs and Data Models — This question tests REST APIs and Data Models — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The JSESSIONID cookie must be included in the request headers for authentication. — A 401 error indicates that authentication is required or has failed. Even with a JSESSIONID cookie, the engineer must include it in the request headers. Additionally, vManage APIs often require a CSRF token for state-changing operations, but for GET requests, the JSESSIONID should suffice. The most likely cause is that the cookie is not being sent with the request, or the session has expired.

What should I do if I get this 350-401 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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