200-901 Cisco Platforms and Development Practice Question
This 200-901 practice question tests your understanding of cisco platforms and development. 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.
You are a DevNet engineer responsible for automating configuration management across a Cisco SD-WAN fabric. You have been using the vManage REST API to retrieve device inventory and template lists. You generate an API token with read/write scope and successfully execute GET requests to /dataservice/device and /dataservice/template/device to list devices and templates. Now you want to attach a specific template to a device using POST /dataservice/template/device/config/attach. Your Python script uses the correct URL and includes the token in the Authorization header. The request body contains the device UUID and template UUID retrieved earlier. However, the API returns an HTTP 403 Forbidden error. You have verified that the device UUID and template UUID are correct and that the template exists. The vManage server logs indicate no high resource usage. What is the most likely cause of the 403 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The template is already attached to the device.
An HTTP 403 Forbidden error indicates the server understood the request but refuses to authorize it. Since the token worked for GET requests but not for the POST attach operation, the most likely cause is insufficient privileges. The token may have been generated with read-only scope for the attach operation, or the token's scope explicitly denied write access to this API. The other options are less likely: device group membership does not affect authorization; template already attached would yield a 400 or 409; version incompatibility would give a 404 or 501.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 vManage version does not support the attach API.
Why it's wrong here
Version incompatibility would result in a 404 Not Found or 501 Not Implemented, not 403.
✓
The template is already attached to the device.
Why this is correct
If the template is already attached, the API would return a 409 Conflict or 400 Bad Request, not 403.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Authentication checks who the user is.
✗
The device is not part of any template group.
Why it's wrong here
Device group membership is not directly related to authorization; this would cause a different error.
✗
The API token has been issued only with read scope for the attach operation.
Why it's wrong here
This is actually correct; token scope is the likely issue.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Real-world example
How this comes up in practice
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
Got this wrong? Here's your next step.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 200-901 questions on access control and AAA configuration.
Cisco Platforms and Development — This question tests Cisco Platforms and Development — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: The template is already attached to the device. — An HTTP 403 Forbidden error indicates the server understood the request but refuses to authorize it. Since the token worked for GET requests but not for the POST attach operation, the most likely cause is insufficient privileges. The token may have been generated with read-only scope for the attach operation, or the token's scope explicitly denied write access to this API. The other options are less likely: device group membership does not affect authorization; template already attached would yield a 400 or 409; version incompatibility would give a 404 or 501.
What should I do if I get this 200-901 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 200-901 questions on access control and AAA configuration.
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?
Authentication checks who the user is.
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