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166 Questions & Answers

Last Update: Sep 26, 2026

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Microsoft AI-901 Practice Test 25

Question 240

An AI product team has just deployed a chat model and wants to compare system prompts against realistic customer questions before writing a full client. What Foundry feature is the most direct starting point?

  1. Judge readiness solely from a successful deployment-created notification.
  2. Use the model playground to test representative prompts, outputs and safety cases against the deployment.
  3. Publish a customer-facing chatbot without trying any test prompts.
  4. Test prompts against a different catalog model and assume those outputs establish the readiness of the newly deployed chat endpoint.

Explanation

Correct Answer

B:

The Foundry playground permits interactive requests against the selected deployed model, enabling representative system/user prompts and edge-case evaluations before the SDK client is finalized. Record limitations and correct failures before promotion.

Incorrect Answers

A:

A created-deployment notification proves a management operation completed, not that customer prompts, grounding, safety behavior or response shape meet release requirements.

C:

Publishing a chatbot after provisioning alone exposes users to untested hallucinations, prompt-injection attempts and tool errors. Functional and safety tests are still required.

D:

Model-catalog examples or results from a different model do not exercise the chosen deployed model's actual instructions, safety behavior or endpoint configuration. The target deployment must be tested directly.

Question 241

A Foundry client receives HTTP 401 using an expired access token, then receives HTTP 403 after obtaining a new token for the correct audience. What is the appropriate diagnostic sequence?

  1. Refresh or reacquire a valid audience-scoped credential for the 401, then check the principal’s effective inference role and resource permissions for the 403.
  2. Increase the model context window because an undersized prompt makes Azure return authentication errors.
  3. Assume a new token guarantees authorization on every project and ignore the 403 result.
  4. Change temperature and max-output tokens until the resource accepts the credential and grants access.

Explanation

Correct Answer

A:

HTTP 401 indicates missing or invalid authentication; token expiry and audience matter. HTTP 403 can follow valid authentication when the principal lacks permission to call the selected deployment or resource.

Incorrect Answers

B:

Context size is validated only for an authorized inference request. It cannot repair an invalid access token or a denied RBAC permission.

C:

Authentication proves an identity or token was accepted, not that the identity has inference rights to this particular Foundry project and deployment.

D:

Sampling and output-budget settings do not affect Entra ID token validation or Azure role enforcement. Diagnose the two security layers separately.

Question 242

A government team requires inference inside its Azure geography. The preferred model appears in the catalog but does not support the needed geography-bound deployment type in the selected region. What should the deployment approval workflow do?

  1. Choose Global Standard automatically because any successful deployment is more important than a documented geography constraint.
  2. Hold approval and verify a supported regional deployment, alternate compliant model or authorized location; do not fall back to global processing without a formal policy decision.
  3. Enable storage replication exclusively inside the approved geography and infer that the inference-processing deployment will inherit that boundary.
  4. Specify a geography-restricted SKU in the deployment template despite the selected model lacking that SKU in this region, then assume the platform will silently provide equivalent local processing.

Explanation

Correct Answer

B:

Treat geography-bound processing as a hard deployment gate. Verify the model, region and supported deployment type; otherwise choose an authorized compliant alternative or record a formal policy decision before any geographic fallback.

Incorrect Answers

A:

Global Standard may route inference outside the required Azure geography even when the resource itself is created locally. Deployment success alone does not demonstrate compliance with the organization’s processing-location restriction.

C:

Data-at-rest replication and where model inference executes are independent platform settings. A model that lacks a supported geography-bound deployment cannot be made compliant by storage placement alone.

D:

A template cannot create support for a model-and-region SKU that the provider does not offer. The deployment may fail or differ from the intended contract; verify actual supported regional processing before release.

Question 243

A Foundry team already uses a supported provisioned model deployment. Its request-per-minute count is steady, but p95 latency rises sharply after a product update starts producing much longer responses. Before purchasing more provisioned capacity, what should the team measure?

  1. The average prompt count only, because all prompts consume identical compute regardless of output length.
  2. Increase every request timeout and assume the longer wait creates additional provisioned throughput.
  3. The number of users with an open browser tab, without examining issued requests or response tokens.
  4. Input and generated token volume, concurrency, deployment utilization and queueing against the supported provisioned throughput limits.

Explanation

Correct Answer

D:

Compare input and output tokens per request, concurrent active work, utilization and queueing against supported provisioned limits. The jump in p95 may be workload-driven and should be distinguished from insufficient reserved capacity before buying more.

Incorrect Answers

A:

Request counts alone omit the per-request token workload. After a change to longer responses, the same RPM can represent materially more generated tokens and sustained compute demand.

B:

A longer client timeout permits waiting but does not create provisioned throughput. It may mask increasing queues or exceed the application’s user-facing latency objectives.

C:

Browser-session counts are a weak proxy: some users are idle and others generate long outputs concurrently. Capacity assessment needs actual inference requests and token/queue metrics.

Question 244

A team tested a supported Foundry instant-access model in the portal. Later, the team creates a production model deployment named `helpdesk-prod` in its Azure resource. The client still sends the catalog model label and receives “deployment not found.” What configuration should be checked?

  1. Raise the maximum output-token setting because that controls how deployment aliases are resolved.
  2. Use the endpoint, credentials and actual deployment name of the production resource rather than assuming the preview catalog label is its deployment ID.
  3. Enable instant preview again and assume the preview request permanently creates the named production deployment.
  4. Call a deployment named `helpdesk-prod` through the unrelated preview project endpoint, without verifying which resource actually hosts it.

Explanation

Correct Answer

B:

Configure the production resource’s actual endpoint, identity and deployed alias helpdesk-prod. Instant-access trial model names and permanent deployment identifiers need not coincide, and each endpoint resolves its own deployment inventory.

Incorrect Answers

A:

Maximum output tokens affects response length, not which deployment name an endpoint recognizes. Changing it will not make the preview catalog label resolve to a production resource.

C:

Instant access can provide temporary trial inference for supported models without an ordinary production deployment. Reopening preview is not evidence that a managed deployment was created in the target resource.

D:

A valid deployment alias on one resource cannot be assumed to exist on an unrelated project or preview endpoint. Endpoint selection, authorization and alias lookup must refer to the same deployed resource.

Question 245

After a Foundry model revision change, a scheduling agent starts generating `startTimeUtc` in tool calls, but its application tool contract still requires `start_at`. Chat text looks normal, yet reservations fail validation. Which targeted release check is most useful?

  1. Change only the scheduling tool description to mention `start_at`, without validating actual emitted arguments or confirming tool success.
  2. Run contract tests on emitted tool names and typed argument fields against the registered schema, reject nonconforming calls, and adapt the integration only after verifying the correct model contract.
  3. Normalize `startTimeUtc` to `start_at` on the UI without checking time-zone semantics, field type or the server-side tool contract.
  4. Accept either argument name by disabling strict tool schema validation and trusting the downstream API to interpret the JSON.

Explanation

Correct Answer

B:

The observed regression is at the boundary between the model tool arguments and the implementation schema. Assert the required parameter name, type and temporal semantics, reject invalid calls, and test the confirmed scheduling result before promotion.

Incorrect Answers

A:

A better description might influence future tool calls, but it cannot prove the model’s actual payload matches the registered contract. Negative and success-path contract testing is still needed.

C:

Renaming a UI key can make the payload appear compatible but lose the meaning of a UTC instant or required date/time type. The service contract and authorized operation must be tested end-to-end.

D:

Relaxing schema validation hides an incompatible model-to-tool interface and may permit unauthorized or mistyped bookings. A valid scheduling API call requires an explicit checked contract.

Question 246

An app has a correct Foundry project URL for SDK operations but points the inference request to an unrelated Speech resource endpoint. It receives an API mismatch. What should be corrected?

  1. Change only the system prompt to mention the project URL.
  2. Use the endpoint type documented for the intended deployed model and SDK operation.
  3. Disable authentication to bypass the wrong endpoint's errors.
  4. Assume every Azure AI service endpoint shares the same request schema.

Explanation

Correct Answer

B:

Use the project endpoint for documented SDK project operations and the supported model inference endpoint/client for the deployed chat model. An Azure Speech resource exposes different operations and will not parse generic Foundry inference payloads.

Incorrect Answers

A:

Prompt wording does not alter the URL or API route used by the HTTP client. The mismatch is between service endpoint types and request contracts, not the user’s topic.

C:

Unauthenticated requests would still reach the wrong service and create access-control failures. Removing identity checks does not transform a Speech API into a chat model API.

D:

Azure services do not share a universal HTTP path or response schema merely because they belong to the same subscription. Match resource type, API version and SDK operation explicitly.

Question 247

A deployed model starts returning rate-limit errors under peak load. Select TWO useful responses.

  1. Inspect the deployment's quota, requests/tokens-per-minute limits and current capacity consumption.
  2. Switch the model to a larger maximum-output-token setting without measuring TPM consumption or request admission.
  3. Apply bounded exponential backoff that respects server retry guidance and uses safe request correlation.
  4. Retry 429 responses at a fixed very short delay without reading `Retry-After` or controlling concurrent requests.
  5. Scale the client-side worker count alone and assume additional parallel requests increase the service quota.

Explanation

Correct Answers

A:

Inspect RPM/TPM limits and actual usage to determine whether the endpoint is refusing requests because of quota, token consumption or capacity. A deployment change should be based on measured constraints.

C:

Bounded retries with jitter and server guidance reduce retry storms. Request correlation also prevents the client from treating a throttled model call as successful or duplicating a later action.

Incorrect Answers

B:

A higher output allowance may consume more token budget and can worsen throttling. It does not increase the granted rate or reserved capacity for this deployment.

D:

An aggressively fixed retry interval can keep the deployment saturated and ignores documented retry delays. Admission control needs adaptive backoff and concurrency limits.

E:

Adding callers sends more work to the same rate-limited service. Without sufficient quota or throughput this can increase rather than resolve rejection rates.

Question 248

A Foundry playground test returns instructions that the business categorizes as unsafe. What must be evaluated before giving customers access?

  1. Use a friendlier output voice while leaving the unsafe text unchanged.
  2. Disable all moderation because the model follows business instructions most of the time.
  3. Review safety/content-filter configuration, prompt boundaries and representative harmful-request tests.
  4. Hide the failed test conversation and report only the last successful prompt.

Explanation

Correct Answer

C:

Review configured content policies, instruction and tool boundaries, and reproducible harmful-request cases. Verify that the deployed configuration handles the observed failure and related paraphrases before customer exposure.

Incorrect Answers

A:

A warmer speaking style changes presentation while preserving the harmful instruction. The defect concerns what the system permits the model to produce or act on.

B:

Success on ordinary prompts cannot justify removing safeguards after a known unsafe output. Real users may issue adversarial or ambiguous requests that need service-level mitigation.

D:

Hiding the failed conversation destroys release evidence and prevents a reliable regression check. Risk evaluation must include the concrete case that demonstrated unsafe behavior.

Question 249

A customer-support app needs to interpret a screenshot, but its deployed Foundry model is documented as text-only. Which correction is necessary?

  1. Select a supported image-capable multimodal deployment or an appropriate vision preprocessing path.
  2. Base64-encode the image in a plain text field without a supported image-content input schema.
  3. Increase output tokens so the model can infer all screenshot details.
  4. Send the screenshot filename as text and assume the model has seen the image.

Explanation

Correct Answer

A:

Text-only deployments cannot interpret arbitrary screenshot pixels through a visual input message. Select a model with documented image-input support or extract the relevant visual evidence through an approved vision/OCR component first.

Incorrect Answers

B:

Base64 bytes placed inside ordinary text do not constitute a supported image part in the request schema. The model may treat them as meaningless text rather than decode and inspect pixels.

C:

Increasing generation allowance permits longer output but provides no new visual sensing capability. The model still lacks the screenshot evidence requested by the customer.

D:

A filename can identify a file location but does not reveal visible interface details, errors or controls. Actual image content must reach a supported visual input path.

Question 250

A Foundry project contains several deployments with different context windows, modality support and prices. A client must answer a long text question economically. What governs deployment selection?

  1. Call the base model catalog name and assume the client will resolve it automatically to the deployment configured for that project.
  2. Use the configured deployment alias whose tested capability, limits, costs and policy satisfy this workload.
  3. Pick the deployment with the largest stated context window without checking whether its latency, data-location policy or unit price fits this request.
  4. Pick the lowest-priced deployment and truncate the long user request whenever it exceeds that model’s supported token budget.

Explanation

Correct Answer

B:

Match the long-text workload to a tested deployment whose context capacity, text support, cost, latency and policy fit the request. Use its actual callable alias and enforce a token budget.

Incorrect Answers

A:

The deployment alias is an application resource identifier, not necessarily the catalog model identifier. Automatic name substitution can invoke the wrong target or fail resolution.

C:

A larger window can admit long inputs, but it does not prove acceptable residency, cost or task quality. All relevant constraints must be evaluated for the actual deployment.

D:

Truncating important requirements can make a cheaper deployment unusable or incorrect. Economy is evaluated only after context capacity and accuracy are demonstrated.


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