McAfee Secure

Microsoft MB-820 Bundle

Exam Code: MB-820

Exam Name Microsoft Dynamics 365 Business Central Developer

Certification Provider: Microsoft

Corresponding Certification: Microsoft Certified: Dynamics 365 Business Central Developer Associate

Microsoft MB-820 Bundle $19.99

100% Microsoft MB-820 Guaranteed Success With Testking Training Materials

Get Real MB-820 Exam Questions & Expert Verified Answers as Experienced on the Real Exam!

  • Questions & Answers

    MB-820 Questions & Answers

    131 Questions & Answers

    The ultimate exam preparation tool, Questions & Answers mirrors the actual MB-820 exam while allowing you to hone and measure every aspect of your test-taking ability.

  • Study Guide

    MB-820 Study Guide

    948 PDF Pages

    Developed by industry experts, this 948-page guide spells out in painstaking detail all of the information you need to ace MB-820 exam.

Microsoft Dynamics 365 Business Central Developer (MB-820) Practice Tests

Satisfaction Guaranteed

Money Back Guarantee

Testking provides hassle-free money back guarantee with our products. That is because we have 100% trust in the abilities of our professional and experience product team, and our record is a proof of that.

99.6% PASS RATE
Total Cost: $154.98
Bundle Price: $134.99

Purchase Individually

  • Questions & Answers

    Questions & Answers

    131 Questions

    $124.99
  • Study Guide

    Study Guide

    948 PDF Pages

    $29.99

Microsoft MB-820 Practice Test 43

Question 420

At fictional Foxglove Medical, the Business Central development team is supporting regulated item distribution and reviewing external-service integration during a troubleshooting exercise (MB820-6.2-200). The observed development issue is that a custom API returns sensitive customer columns because all fields from the backing table were added to the API page. Which recurring engineering check would best prevent this issue from returning?

  1. Diff published schemas before deployment.
  2. Audit API field lists and permission behavior after schema changes.
  3. Test multi-line and missing-child API responses.
  4. Check supported API object capabilities before planning extensions.

Explanation

Correct Answer

B:

The ongoing check is to audit API field lists and permission behavior after schema changes. This helps detect recurrence when a custom API returns sensitive customer columns because all fields from the backing table were added to the API page. The associated correction is to expose only the minimal approved fields and apply entitlement and permission rules; a confirming result is that the API payload omits protected fields for unauthorized consumers. Applied here, the relevant facts are: The observed development issue is that a custom API returns sensitive customer columns because all fields from the backing table were added to the API page. The question asks which recurring engineering check would best prevent this issue from returning.

Incorrect Answers

A:

“Diff published schemas before deployment” concerns the alternative task “preserve compatible contracts or introduce a deliberate versioned API and migration path”, but the stated failure is that a custom API returns sensitive customer columns because all fields from the backing table were added to the API page. The required measure is to audit API field lists and permission behavior after schema changes.

C:

“Test multi-line and missing-child API responses” supports the separate task “design appropriate API page parts or supported related entity navigation with stable keys”, not the reported problem: a custom API returns sensitive customer columns because all fields from the backing table were added to the API page. This case instead calls for “Audit API field lists and permission behavior after schema changes”.

D:

“Check supported API object capabilities before planning extensions” concerns the separate step “publish a compatible new API contract or supported API page design rather than assuming API page extension is available”. The reported issue is that a custom API returns sensitive customer columns because all fields from the backing table were added to the API page, so the direct response is to audit API field lists and permission behavior after schema changes.

Question 421

At fictional Zincfield Sports, the Business Central development team is supporting equipment sales and replenishment and reviewing external-service integration during a sandbox design review (MB820-6.1-186). The observed development issue is that an invoice connector sees API 429 responses and retries without any backoff. Which AL development or design response most directly addresses this issue?

  1. Inspect JSON token types and iterate JsonArray elements using supported AL JSON APIs.
  2. Implement bounded retries honoring appropriate rate-limit signals and business operation idempotency.
  3. Configure the required request headers and validated HTTP method before calling.
  4. Use AL HttpClient/HttpRequestMessage to invoke the authorized REST endpoint and parse its response.

Explanation

Correct Answer

B:

The most direct corrective response is to implement bounded retries honoring appropriate rate-limit signals and business operation idempotency. This addresses the specific failure where an invoice connector sees API 429 responses and retries without any backoff. Acceptance evidence is that a throttled test eventually succeeds or fails within an approved budget without duplicate business action.

Incorrect Answers

A:

The proposed “Inspect JSON token types and iterate JsonArray elements using supported AL JSON APIs” tests a different control: inspect JSON token types and iterate JsonArray elements using supported AL JSON APIs. The reported condition is that an invoice connector sees API 429 responses and retries without any backoff; the more direct action is to implement bounded retries honoring appropriate rate-limit signals and business operation idempotency.

C:

“Configure the required request headers and validated HTTP method before calling” concerns the separate step “configure the required request headers and validated HTTP method before calling”. The reported issue is that an invoice connector sees API 429 responses and retries without any backoff, so the direct response is to implement bounded retries honoring appropriate rate-limit signals and business operation idempotency.

D:

“Use AL HttpClient/HttpRequestMessage to invoke the authorized REST endpoint and parse its response” concerns the alternative task “use AL HttpClient/HttpRequestMessage to invoke the authorized REST endpoint and parse its response”, but the stated failure is that an invoice connector sees API 429 responses and retries without any backoff. The required measure is to implement bounded retries honoring appropriate rate-limit signals and business operation idempotency.

Question 422

At fictional Zincfield Sports, the Business Central development team is supporting equipment sales and replenishment and reviewing external-service integration during a sandbox design review (MB820-6.1-186). The observed development issue is that an invoice connector sees API 429 responses and retries without any backoff. Which observed result would most clearly show the intended correction works?

  1. A throttled test eventually succeeds or fails within an approved budget without duplicate business action.
  2. A simulated timeout returns control without committing an unsupported external result.
  3. All shipment entries are parsed without truncation or runtime conversion errors.
  4. The partner accepts a correctly formatted request and returns the expected schema.

Explanation

Correct Answer

A:

This is the outcome that directly verifies the intended correction: a throttled test eventually succeeds or fails within an approved budget without duplicate business action. The related solution is to implement bounded retries honoring appropriate rate-limit signals and business operation idempotency; it is based on the principle that rate limiting and idempotent retries are integration reliability concerns.

Incorrect Answers

B:

“A simulated timeout returns control without committing an unsupported external result” concerns the separate step “set an appropriate request timeout and implement a bounded failure path or asynchronous design where needed”. The reported issue is that an invoice connector sees API 429 responses and retries without any backoff, so the direct response is to a throttled test eventually succeeds or fails within an approved budget without duplicate business action.

C:

“All shipment entries are parsed without truncation or runtime conversion errors” concerns the alternative task “inspect JSON token types and iterate JsonArray elements using supported AL JSON APIs”, but the stated failure is that an invoice connector sees API 429 responses and retries without any backoff. The required measure is to a throttled test eventually succeeds or fails within an approved budget without duplicate business action.

D:

The proposed “The partner accepts a correctly formatted request and returns the expected schema” tests a different control: build a JsonObject/JsonToken payload and set the appropriate content headers. The reported condition is that an invoice connector sees API 429 responses and retries without any backoff; the more direct action is to a throttled test eventually succeeds or fails within an approved budget without duplicate business action.

Question 423

At fictional Zincfield Sports, the Business Central development team is supporting equipment sales and replenishment and reviewing external-service integration during a sandbox design review (MB820-6.1-186). The observed development issue is that an invoice connector sees API 429 responses and retries without any backoff. Which Business Central or AL development principle best explains the right response?

  1. Rate limiting and idempotent retries are integration reliability concerns.
  2. Remote request construction must preserve input-data boundaries.
  3. HTTP request and response metadata serve distinct protocol roles.
  4. JSON object and array types are distinct structural contracts.

Explanation

Correct Answer

A:

The governing principle is that rate limiting and idempotent retries are integration reliability concerns. The engineering response is to implement bounded retries honoring appropriate rate-limit signals and business operation idempotency. Verification should show that a throttled test eventually succeeds or fails within an approved budget without duplicate business action.

Incorrect Answers

B:

“Remote request construction must preserve input-data boundaries” concerns the alternative task “validate input and use appropriate URI encoding for outbound requests”, but the stated failure is that an invoice connector sees API 429 responses and retries without any backoff. The required measure is to implement bounded retries honoring appropriate rate-limit signals and business operation idempotency.

C:

The proposed “HTTP request and response metadata serve distinct protocol roles” tests a different control: configure the required request headers and validated HTTP method before calling. The reported condition is that an invoice connector sees API 429 responses and retries without any backoff; the more direct action is to implement bounded retries honoring appropriate rate-limit signals and business operation idempotency.

D:

“JSON object and array types are distinct structural contracts” supports the separate task “inspect JSON token types and iterate JsonArray elements using supported AL JSON APIs”, not the reported problem: an invoice connector sees API 429 responses and retries without any backoff. This case instead calls for “implement bounded retries honoring appropriate rate-limit signals and business operation idempotency”.

Question 424

At fictional Zincfield Sports, the Business Central development team is supporting equipment sales and replenishment and reviewing external-service integration during a sandbox design review (MB820-6.1-186). The observed development issue is that an invoice connector sees API 429 responses and retries without any backoff. Which recurring engineering check would best prevent this issue from returning?

  1. Include arrays with zero, one and many items in regression tests.
  2. Verify headers with a controlled mock endpoint.
  3. Track retry amplification per endpoint.
  4. Run JSON contract tests against staging service examples.

Explanation

Correct Answer

C:

The ongoing check is to track retry amplification per endpoint. This helps detect recurrence when an invoice connector sees API 429 responses and retries without any backoff. The associated correction is to implement bounded retries honoring appropriate rate-limit signals and business operation idempotency; a confirming result is that a throttled test eventually succeeds or fails within an approved budget without duplicate business action.

Incorrect Answers

A:

“Include arrays with zero, one and many items in regression tests” concerns the alternative task “inspect JSON token types and iterate JsonArray elements using supported AL JSON APIs”, but the stated failure is that an invoice connector sees API 429 responses and retries without any backoff. The required measure is to track retry amplification per endpoint.

B:

The proposed “Verify headers with a controlled mock endpoint” tests a different control: configure the required request headers and validated HTTP method before calling. The reported condition is that an invoice connector sees API 429 responses and retries without any backoff; the more direct action is to track retry amplification per endpoint.

D:

“Run JSON contract tests against staging service examples” concerns the separate step “build a JsonObject/JsonToken payload and set the appropriate content headers”. The reported issue is that an invoice connector sees API 429 responses and retries without any backoff, so the direct response is to track retry amplification per endpoint.

Question 425

At fictional Beacon Manufacturing, the Business Central development team is supporting production planning and invoicing and reviewing object model and application extensibility during a troubleshooting exercise (MB820-3.6-121). The observed development issue is that a report's main data source contains totals computed in a slow nested record loop. Which Business Central or AL development principle best explains the right response?

  1. Changing a query's dimensions can alter aggregation grain.
  2. Query join semantics determine cardinality and optional-record handling.
  3. Reports can use query-based aggregation for efficient datasets.
  4. Service exposure does not change a query into a transactional API.

Explanation

Correct Answer

C:

The governing principle is that reports can use query-based aggregation for efficient datasets. The engineering response is to reuse a suitable query data source or aggregate dataset design for report data. Verification should show that a reconciliation report produces correct grouped amounts with lower runtime.

Incorrect Answers

A:

The proposed “Changing a query's dimensions can alter aggregation grain” tests a different control: reevaluate grouping and totals when adding the dimension to the query projection. The reported condition is that a report's main data source contains totals computed in a slow nested record loop; the more direct action is to reuse a suitable query data source or aggregate dataset design for report data.

B:

“Query join semantics determine cardinality and optional-record handling” supports the separate task “define the DataItemLink and join type that match the intended relationship”, not the reported problem: a report's main data source contains totals computed in a slow nested record loop. This case instead calls for “reuse a suitable query data source or aggregate dataset design for report data”.

D:

“Service exposure does not change a query into a transactional API” concerns the alternative task “document the query's read-only contract and choose an API page for supported mutations”, but the stated failure is that a report's main data source contains totals computed in a slow nested record loop. The required measure is to reuse a suitable query data source or aggregate dataset design for report data.

Question 426

At fictional Beacon Manufacturing, the Business Central development team is supporting production planning and invoicing and reviewing object model and application extensibility during a troubleshooting exercise (MB820-3.6-121). The observed development issue is that a report's main data source contains totals computed in a slow nested record loop. Which recurring engineering check would best prevent this issue from returning?

  1. Compare totals after changes to report data source.
  2. Review query consumers for unintended write expectations.
  3. Test one-to-many and missing-child relationships.
  4. Test grouping with multiple transactions per customer.

Explanation

Correct Answer

A:

The ongoing check is to compare totals after changes to report data source. This helps detect recurrence when a report's main data source contains totals computed in a slow nested record loop. The associated correction is to reuse a suitable query data source or aggregate dataset design for report data; a confirming result is that a reconciliation report produces correct grouped amounts with lower runtime.

Incorrect Answers

B:

“Review query consumers for unintended write expectations” concerns the separate step “use the query for read-oriented analysis and a suitable record/codeunit workflow for writes”. The reported issue is that a report's main data source contains totals computed in a slow nested record loop, so the direct response is to compare totals after changes to report data source.

C:

“Test one-to-many and missing-child relationships” concerns the alternative task “define the DataItemLink and join type that match the intended relationship”, but the stated failure is that a report's main data source contains totals computed in a slow nested record loop. The required measure is to compare totals after changes to report data source.

D:

The proposed “Test grouping with multiple transactions per customer” tests a different control: review grouping columns and Sum/Count aggregation placement. The reported condition is that a report's main data source contains totals computed in a slow nested record loop; the more direct action is to compare totals after changes to report data source.

Question 427

At fictional Beacon Manufacturing, the Business Central development team is supporting production planning and invoicing and reviewing object model and application extensibility during a troubleshooting exercise (MB820-3.6-121). The observed development issue is that a report's main data source contains totals computed in a slow nested record loop. Which observed result would most clearly show the intended correction works?

  1. The query returns one summarized row per desired customer period.
  2. Totals reconcile at both overall and dimension level.
  3. Results retain customers without invoices with appropriately empty joined values.
  4. A reconciliation report produces correct grouped amounts with lower runtime.

Explanation

Correct Answer

D:

This is the outcome that directly verifies the intended correction: a reconciliation report produces correct grouped amounts with lower runtime. The related solution is to reuse a suitable query data source or aggregate dataset design for report data; it is based on the principle that reports can use query-based aggregation for efficient datasets.

Incorrect Answers

A:

“The query returns one summarized row per desired customer period” concerns the separate step “review grouping columns and Sum/Count aggregation placement”. The reported issue is that a report's main data source contains totals computed in a slow nested record loop, so the direct response is to a reconciliation report produces correct grouped amounts with lower runtime.

B:

“Totals reconcile at both overall and dimension level” concerns the alternative task “reevaluate grouping and totals when adding the dimension to the query projection”, but the stated failure is that a report's main data source contains totals computed in a slow nested record loop. The required measure is to a reconciliation report produces correct grouped amounts with lower runtime.

C:

The proposed “Results retain customers without invoices with appropriately empty joined values” tests a different control: select a supported outer-join or alternative query design that preserves missing related records. The reported condition is that a report's main data source contains totals computed in a slow nested record loop; the more direct action is to a reconciliation report produces correct grouped amounts with lower runtime.

Question 428

At fictional Beacon Manufacturing, the Business Central development team is supporting production planning and invoicing and reviewing object model and application extensibility during a troubleshooting exercise (MB820-3.6-121). The observed development issue is that a report's main data source contains totals computed in a slow nested record loop. Which AL development or design response most directly addresses this issue?

  1. Use a query object with an appropriate aggregation method and grouping columns.
  2. Define the DataItemLink and join type that match the intended relationship.
  3. Expose appropriate query columns and links instead of exporting full tables with unused fields.
  4. Reuse a suitable query data source or aggregate dataset design for report data.

Explanation

Correct Answer

D:

The most direct corrective response is to reuse a suitable query data source or aggregate dataset design for report data. This addresses the specific failure where a report's main data source contains totals computed in a slow nested record loop. Acceptance evidence is that a reconciliation report produces correct grouped amounts with lower runtime.

Incorrect Answers

A:

“Use a query object with an appropriate aggregation method and grouping columns” concerns the alternative task “use a query object with an appropriate aggregation method and grouping columns”, but the stated failure is that a report's main data source contains totals computed in a slow nested record loop. The required measure is to reuse a suitable query data source or aggregate dataset design for report data.

B:

The proposed “Define the DataItemLink and join type that match the intended relationship” tests a different control: define the DataItemLink and join type that match the intended relationship. The reported condition is that a report's main data source contains totals computed in a slow nested record loop; the more direct action is to reuse a suitable query data source or aggregate dataset design for report data.

C:

“Expose appropriate query columns and links instead of exporting full tables with unused fields” supports the separate task “expose appropriate query columns and links instead of exporting full tables with unused fields”, not the reported problem: a report's main data source contains totals computed in a slow nested record loop. This case instead calls for “reuse a suitable query data source or aggregate dataset design for report data”.

Question 429

At fictional Cedar Retail Group, the Business Central development team is supporting store procurement and finance and reviewing external-service integration during a troubleshooting exercise (MB820-6.2-196). The observed development issue is that a read-heavy API integration slows down transactional writes because it competes with primary operations. Which Business Central or AL development principle best explains the right response?

  1. API relational contracts must preserve entity identity and relationships.
  2. Read scale-out is an optimization for suitable reads, not a license for stale transactional decisions.
  3. API versioning protects downstream integration dependencies.
  4. Business operations often require action endpoints, not raw field mutation.

Explanation

Correct Answer

B:

The governing principle is that read scale-out is an optimization for suitable reads, not a license for stale transactional decisions. The engineering response is to evaluate supported read scale-out patterns for appropriate read workloads without compromising consistency needs. Verification should show that read traffic is routed as intended while write operations remain correct.

Incorrect Answers

A:

The proposed “API relational contracts must preserve entity identity and relationships” tests a different control: design appropriate API page parts or supported related entity navigation with stable keys. The reported condition is that a read-heavy API integration slows down transactional writes because it competes with primary operations; the more direct action is to evaluate supported read scale-out patterns for appropriate read workloads without compromising consistency needs.

C:

“API versioning protects downstream integration dependencies” concerns the separate step “preserve compatible contracts or introduce a deliberate versioned API and migration path”. The reported issue is that a read-heavy API integration slows down transactional writes because it competes with primary operations, so the direct response is to evaluate supported read scale-out patterns for appropriate read workloads without compromising consistency needs.

D:

“Business operations often require action endpoints, not raw field mutation” concerns the alternative task “implement or expose an appropriate supported bound/unbound action that invokes validated posting logic”, but the stated failure is that a read-heavy API integration slows down transactional writes because it competes with primary operations. The required measure is to evaluate supported read scale-out patterns for appropriate read workloads without compromising consistency needs.

Question 430

At fictional Cedar Retail Group, the Business Central development team is supporting store procurement and finance and reviewing external-service integration during a troubleshooting exercise (MB820-6.2-196). The observed development issue is that a read-heavy API integration slows down transactional writes because it competes with primary operations. Which AL development or design response most directly addresses this issue?

  1. Evaluate supported read scale-out patterns for appropriate read workloads without compromising consistency needs.
  2. Publish a compatible new API contract or supported API page design rather than assuming API page extension is available.
  3. Design appropriate API page parts or supported related entity navigation with stable keys.
  4. Expose only the minimal approved fields and apply entitlement and permission rules.

Explanation

Correct Answer

A:

The most direct corrective response is to evaluate supported read scale-out patterns for appropriate read workloads without compromising consistency needs. This addresses the specific failure where a read-heavy API integration slows down transactional writes because it competes with primary operations. Acceptance evidence is that read traffic is routed as intended while write operations remain correct.

Incorrect Answers

B:

“Publish a compatible new API contract or supported API page design rather than assuming API page extension is available” concerns the separate step “publish a compatible new API contract or supported API page design rather than assuming API page extension is available”. The reported issue is that a read-heavy API integration slows down transactional writes because it competes with primary operations, so the direct response is to evaluate supported read scale-out patterns for appropriate read workloads without compromising consistency needs.

C:

“Design appropriate API page parts or supported related entity navigation with stable keys” concerns the alternative task “design appropriate API page parts or supported related entity navigation with stable keys”, but the stated failure is that a read-heavy API integration slows down transactional writes because it competes with primary operations. The required measure is to evaluate supported read scale-out patterns for appropriate read workloads without compromising consistency needs.

D:

The proposed “Expose only the minimal approved fields and apply entitlement and permission rules” tests a different control: expose only the minimal approved fields and apply entitlement and permission rules. The reported condition is that a read-heavy API integration slows down transactional writes because it competes with primary operations; the more direct action is to evaluate supported read scale-out patterns for appropriate read workloads without compromising consistency needs.