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Last Update: Nov 05, 2026

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Microsoft AB-100 Practice Test 19

Question 180

A Copilot Studio agent must invoke an external financial validation API. What extensibility contract should be designed?

  1. An action that accepts customer IDs without verifying record-level access.
  2. An authenticated, typed action with explicit input checks, errors and least-privilege permissions.
  3. A connector that treats any HTTP 200 body as confirmed financial validation.
  4. A free-text URL assembled by the model with a tenant administrator secret.

Explanation

Correct Answer

B:

A governed tool requires reliable schema, authorization, response interpretation and safe failure handling.

Incorrect Answers

A:

Unverified IDs enable cross-customer retrieval or mutation.

C:

Transport success is not substantive business approval.

D:

Open-ended generated URLs can redirect requests or expose secrets.

Question 181

A Copilot Studio agent will call an MCP server exposing multiple CRM tools. What is a key requirement for its architecture?

  1. Rely on an agent prompt to grant OAuth consent on behalf of any user.
  2. Treat every advertised MCP tool as safe for unrestricted execution.
  3. Use server-wide credentials for all MCP tools and rely on the model to select only those operations a given employee may use.
  4. Authenticate the server and restrict which tool operations a user may invoke through it.

Explanation

Correct Answer

D:

MCP standardizes tool discovery, not authorization; the service must enforce identities and scopes.

Incorrect Answers

A:

Consent and delegated access require approved authentication flows.

B:

Tool presence does not confer permissions.

C:

Model choice cannot enforce caller-level permissions; tool execution must be authorized under constrained identities and scopes.

Question 182

A claims workflow needs an agent to interact with a legacy web form lacking an API. The computer-use capability is being evaluated. Which safeguard is important?

  1. Limit UI automation to approved pages and verify consequential submissions before committing.
  2. Assume visual automation is guaranteed production-ready for every site.
  3. Record the UI submit-button click as a completed business transaction without querying or confirming the resulting claim ID.
  4. Give the agent unrestricted desktop controls and permanent payment credentials.

Explanation

Correct Answer

A:

Computer Use needs product availability checks, scoped execution and result verification like other tools.

Incorrect Answers

B:

Availability and behavior depend on the supported runtime and release stage.

C:

A click can be rejected by client validation, networking or business rules; successful automation needs an authoritative post-submit record or receipt.

D:

Broad controls greatly expand unintended side-effect risk.

Question 183

A support agent is configured for voice mode but a proposed workflow uses a service that only accepts text. What should the architect evaluate?

  1. Send recorded audio bytes directly into a text-only connector and assume the tool will transcribe the recording implicitly.
  2. A supported speech-to-text boundary and whether the agent mode supports the intended tool behavior.
  3. Tell the model to invent the transcript when speech processing fails.
  4. Assume every text-only connector receives audio automatically.

Explanation

Correct Answer

B:

Voice features have modality and runtime requirements that must be explicitly met.

Incorrect Answers

A:

A connector accepting text parameters does not necessarily process audio; introduce a supported speech transcription interface with appropriate error handling.

C:

Invented transcripts cannot support customer decisions.

D:

Text APIs cannot be assumed to process raw audio.

Question 184

A Teams-based agent retrieves SharePoint project files for a meeting attendee. What access rule must hold?

  1. The model should answer from hidden documents but omit citations.
  2. A Team name is sufficient to grant document owner permissions.
  3. Results must respect that attendee’s actual SharePoint permissions rather than the Teams channel membership alone.
  4. Any attendee may view all files indexed by the agent.

Explanation

Correct Answer

C:

Collaboration context and resource-level entitlements are separate, and both matter for safe retrieval.

Incorrect Answers

A:

Omitting citations cannot erase unauthorized source exposure.

B:

Group labels alone do not confer owner rights.

D:

Indexed availability does not mean every attendee can read a source.

Question 185

A custom Foundry classifier is technically feasible, but model drift is expected after product changes. What extensibility decision must include ongoing support?

  1. Use a larger GPU as the only drift mitigation.
  2. Let the model silently overwrite approved labels when drift occurs.
  3. Treat model training as a one-time project with no evaluation after launch.
  4. Design retraining triggers, validated model versions and rollback as part of the custom-model lifecycle.

Explanation

Correct Answer

D:

Custom models need monitored behavior and governed updates as the underlying task evolves.

Incorrect Answers

A:

Compute cannot repair shifted label semantics.

B:

Unreviewed label changes damage auditability.

C:

New products can invalidate prior training assumptions.

Question 186

An employee tries to add an M365 Copilot extension that retrieves customer balances. The extension can authenticate only with a fixed service admin account. What should happen?

  1. Reject broad production access until a supported scope-aware authorization design exists.
  2. Index all customer balances publicly and keep UI results private.
  3. Let users enter a guessed customer number to fetch records.
  4. Allow it because every employee has a Microsoft 365 license.

Explanation

Correct Answer

A:

A convenient extension does not justify bypassing finance data permissions.

Incorrect Answers

B:

Public data access defeats confidentiality.

C:

Unverified identifiers cannot establish a right to financial records.

D:

Host licensing is unrelated to the required resource entitlement.

Question 187

A Copilot Studio custom action calls a supplier API with rate limits. What mechanism should its wrapper support?

  1. Treat throttling as a successful supplier update.
  2. Disable operational telemetry for the action to reduce tokens.
  3. Retry forever with a new purchase order ID for each attempt.
  4. Bounded retry with backoff, explicit rate-limit errors and idempotent transaction handling.

Explanation

Correct Answer

D:

A resilient wrapper must preserve request identity and manage transient limits without duplicating writes.

Incorrect Answers

A:

A 429 response is not a confirmed business transaction.

B:

Loss of diagnostics obscures failure and recovery.

C:

New IDs may generate duplicate orders.

Question 188

An MCP server exposes read_customer and update_payment tools. An analyst needs only customer lookup. How should least privilege be applied?

  1. Issue scoped credentials and tool policy allowing read_customer only for authorized records.
  2. Share a single unrestricted server token among all analysts.
  3. Use a system prompt as the only protection against payment writes.
  4. Give the analyst both tools because the protocol exposes them together.

Explanation

Correct Answer

A:

MCP discovery and effective permission are distinct; the service must enforce role-specific actions.

Incorrect Answers

B:

Shared broad tokens weaken identity attribution and least privilege.

C:

Prompts cannot prevent bypass of back-end update permissions.

D:

Tool advertisement is not authorization.

Question 189

A legacy ERP web workflow occasionally displays an MFA challenge after login. An agent operating through Computer Use gets stuck. What is the safe policy?

  1. Copy a real user’s MFA recovery codes into the agent prompt.
  2. Stop and require an authorized user to complete the interactive authentication step.
  3. Have Computer Use repeatedly submit stale one-time codes captured earlier until the MFA challenge succeeds.
  4. Disable MFA for every user so automation runs smoothly.

Explanation

Correct Answer

B:

Interactive identity challenges require proper human consent and should not be bypassed.

Incorrect Answers

A:

Recovery codes are sensitive secrets, not agent input.

C:

MFA challenges require a currently authorized authentication factor. Automated replay is not a supported substitute for user completion.

D:

Removing MFA weakens the enterprise security posture.

Question 190

A contact agent can reason in multiple steps and can receive audio. A business sponsor assumes these modes guarantee every answer is supported. What evaluation is required?

  1. Verify factual grounding, tool permissions and modality-specific errors for the actual deployed configuration.
  2. Treat reasoning mode as proof that source citations are correct.
  3. Assume microphone capture guarantees that the customer was authenticated.
  4. Skip scenario tests if the model speaks confidently.

Explanation

Correct Answer

A:

A feature mode changes interaction behavior but does not certify evidence accuracy or authorization.

Incorrect Answers

B:

Reasoning traces can still use unsupported facts.

C:

Voice input is not an identity attestation.

D:

Confidence does not replace test evidence.


Agentic AI Business Solutions Architect (AB-100) Practice Tests
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