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MB-820 Premium File: 131 Questions & Answers

Last Update: Oct 12, 2026

MB-820 PDF Study Guide: 948 Pages

$74.99

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Microsoft MB-820 Practice Test 72

Question 710

A warehouse application sometimes times out and engineers guess which database operation is expensive. The developer recommends the following change: Use timing and performance telemetry to locate the measured slow operation before optimizing. Which technical explanation most directly justifies it in this case?

  1. Environment-level telemetry sends service operation events to Azure Application Insights for monitoring and troubleshooting
  2. Application-level telemetry can emit extension-related events to an app publisher's resource separately from general environment telemetry
  3. Performance work should target observed long-running calls rather than speculative components
  4. Custom feature telemetry records application-specific behavior that generic infrastructure events may not reveal

Explanation

Correct Answer

C:

Performance work should target observed long-running calls rather than speculative components. It connects the proposed action to the exact failure or requirement—A warehouse application sometimes times out and engineers guess which database operation is expensive. Confirmation would be instrumented measurements identify a slow code path and show reduced duration after a controlled fix.

Incorrect Answers

A:

That mechanism explains why the alternative action—enable and verify environment-level telemetry to the intended application insights resource—helps in another case. It does not justify the proposed fix here; performance work should target observed long-running calls rather than speculative components. The distinguishing requirement is: A warehouse application sometimes times out and engineers guess which database operation is expensive.

B:

That mechanism explains why the alternative action—configure supported app-level application insights telemetry for the extension—helps in another case. It does not justify the proposed fix here; performance work should target observed long-running calls rather than speculative components. The distinguishing requirement is: A warehouse application sometimes times out and engineers guess which database operation is expensive.

D:

That mechanism explains why the alternative action—emit purposeful custom feature telemetry such as usage, uptake and error signals—helps in another case. It does not justify the proposed fix here; performance work should target observed long-running calls rather than speculative components. The distinguishing requirement is: A warehouse application sometimes times out and engineers guess which database operation is expensive.

Question 711

A warehouse application sometimes times out and engineers guess which database operation is expensive. The team implemented a change aligned with this plan: Use timing and performance telemetry to locate the measured slow operation before optimizing. Which acceptance result specifically verifies that the reported problem is resolved?

  1. Test operations produce expected environment events in the designated resource and environment dimension
  2. Publisher diagnostics show extension-specific operations and failures attributed to the expected app ID
  3. Sample business actions produce identifiable feature events with useful non-sensitive dimensions
  4. Instrumented measurements identify a slow code path and show reduced duration after a controlled fix

Explanation

Correct Answer

D:

Instrumented measurements identify a slow code path and show reduced duration after a controlled fix. This is stronger than an unrelated health check because the desired design action is use timing and performance telemetry to locate the measured slow operation before optimizing, and performance work should target observed long-running calls rather than speculative components. The local requirement is: A warehouse application sometimes times out and engineers guess which database operation is expensive.

Incorrect Answers

A:

This would verify enable and verify environment-level telemetry to the intended application insights resource, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A warehouse application sometimes times out and engineers guess which database operation is expensive. The decisive local proof is instrumented measurements identify a slow code path and show reduced duration after a controlled fix.

B:

This would verify configure supported app-level application insights telemetry for the extension, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A warehouse application sometimes times out and engineers guess which database operation is expensive. The decisive local proof is instrumented measurements identify a slow code path and show reduced duration after a controlled fix.

C:

This would verify emit purposeful custom feature telemetry such as usage, uptake and error signals, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A warehouse application sometimes times out and engineers guess which database operation is expensive. The decisive local proof is instrumented measurements identify a slow code path and show reduced duration after a controlled fix.

Question 712

A warehouse application sometimes times out and engineers guess which database operation is expensive. A targeted trial still reproduces the original gap after the team attempted this change: Use timing and performance telemetry to locate the measured slow operation before optimizing. Which repair directly addresses the remaining defect?

  1. Reproduce with telemetry, identify the expensive operation and optimize that path before retesting
  2. Correct the environment Application Insights connection settings and ingestion access then verify signals
  3. Correct the app manifest telemetry configuration and verify emitted events carry the right app identity
  4. Instrument the missing business paths with appropriate feature telemetry and exclude confidential field values

Explanation

Correct Answer

A:

Reproduce with telemetry, identify the expensive operation and optimize that path before retesting. This directly addresses the remaining defect for the requirement—A warehouse application sometimes times out and engineers guess which database operation is expensive. It restores the mechanism described here: performance work should target observed long-running calls rather than speculative components.

Incorrect Answers

B:

This correction is for the separate condition: A support team wants error and latency signals from an on-premises Business Central instance into Azure Monitor. It would not directly restore the intended behavior in this situation: A warehouse application sometimes times out and engineers guess which database operation is expensive. Here, reproduce with telemetry, identify the expensive operation and optimize that path before retesting, because performance work should target observed long-running calls rather than speculative components.

C:

This correction is for the separate condition: A partner needs platform-generated diagnostics for only one extension across tenants, rather than new manual feature telemetry or whole-environment traces. It would not directly restore the intended behavior in this situation: A warehouse application sometimes times out and engineers guess which database operation is expensive. Here, reproduce with telemetry, identify the expensive operation and optimize that path before retesting, because performance work should target observed long-running calls rather than speculative components.

D:

This correction is for the separate condition: An invoice approval extension needs explicit business-level counters beyond generic page-open telemetry. It would not directly restore the intended behavior in this situation: A warehouse application sometimes times out and engineers guess which database operation is expensive. Here, reproduce with telemetry, identify the expensive operation and optimize that path before retesting, because performance work should target observed long-running calls rather than speculative components.

Question 713

A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. Which single AL development or architecture change best resolves this requirement without redesigning unrelated workflows?

  1. Attach the required authentication header to the outbound HttpRequestMessage or HttpClient request
  2. Parse the response through the AL JSON object, array and token APIs
  3. Use AL HttpClient with an authorized external endpoint and process the HttpResponseMessage
  4. Inspect HTTP status and response body before declaring the exchange successful

Explanation

Correct Answer

C:

This targets the concrete requirement—A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. HttpClient enables outbound HTTP exchanges through supported APIs rather than direct database or host-level integration. The team can establish success when the intended service receives the request and a success/error response is handled and logged appropriately.

Incorrect Answers

A:

This choice primarily fits a different requirement: An external carrier API requires a bearer token on every outbound request from the Business Central extension. There, http authentication headers convey credentials according to the external service's contract rather than as unprotected url query text. In the current situation, A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. HttpClient enables outbound HTTP exchanges through supported APIs rather than direct database or host-level integration. Acceptance requires the intended service receives the request and a success/error response is handled and logged appropriately.

B:

This choice primarily fits a different requirement: A shipping service returns a JSON array of parcels, but AL code treats it as unstructured text and drops identifiers. There, json parsing preserves typed structured fields and nested arrays rather than relying on fragile string matching. In the current situation, A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. HttpClient enables outbound HTTP exchanges through supported APIs rather than direct database or host-level integration. Acceptance requires the intended service receives the request and a success/error response is handled and logged appropriately.

D:

This choice primarily fits a different requirement: An AL HttpClient integration already exchanges requests and responses with an external supplier, but it treats HTTP 429 or 503 responses as success during peak traffic. There, transport completion does not imply application success; the status code and body determine whether the remote operation succeeded. In the current situation, A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. HttpClient enables outbound HTTP exchanges through supported APIs rather than direct database or host-level integration. Acceptance requires the intended service receives the request and a success/error response is handled and logged appropriately.

Question 714

A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. The developer recommends the following change: Use AL HttpClient with an authorized external endpoint and process the HttpResponseMessage. Which technical explanation most directly justifies it in this case?

  1. HTTP authentication headers convey credentials according to the external service's contract rather than as unprotected URL query text
  2. JSON parsing preserves typed structured fields and nested arrays rather than relying on fragile string matching
  3. Transport completion does not imply application success; the status code and body determine whether the remote operation succeeded
  4. HttpClient enables outbound HTTP exchanges through supported APIs rather than direct database or host-level integration

Explanation

Correct Answer

D:

HttpClient enables outbound HTTP exchanges through supported APIs rather than direct database or host-level integration. It connects the proposed action to the exact failure or requirement—A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. Confirmation would be the intended service receives the request and a success/error response is handled and logged appropriately.

Incorrect Answers

A:

That mechanism explains why the alternative action—attach the required authentication header to the outbound httprequestmessage or httpclient request—helps in another case. It does not justify the proposed fix here; httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration. The distinguishing requirement is: A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status.

B:

That mechanism explains why the alternative action—parse the response through the al json object, array and token apis—helps in another case. It does not justify the proposed fix here; httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration. The distinguishing requirement is: A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status.

C:

That mechanism explains why the alternative action—inspect http status and response body before declaring the exchange successful—helps in another case. It does not justify the proposed fix here; httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration. The distinguishing requirement is: A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status.

Question 715

A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. The team implemented a change aligned with this plan: Use AL HttpClient with an authorized external endpoint and process the HttpResponseMessage. Which acceptance result specifically verifies that the reported problem is resolved?

  1. The intended service receives the request and a success/error response is handled and logged appropriately
  2. The authorized endpoint accepts the call with a valid credential and rejects a missing or invalid one
  3. A nested sample payload yields the expected parcel IDs or numeric totals without data loss
  4. Simulated 2xx and error responses follow distinct success, retry or compensating paths without false synchronization

Explanation

Correct Answer

A:

The intended service receives the request and a success/error response is handled and logged appropriately. This is stronger than an unrelated health check because the desired design action is use al httpclient with an authorized external endpoint and process the httpresponsemessage, and httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration. The local requirement is: A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status.

Incorrect Answers

B:

This would verify attach the required authentication header to the outbound httprequestmessage or httpclient request, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. The decisive local proof is the intended service receives the request and a success/error response is handled and logged appropriately.

C:

This would verify parse the response through the al json object, array and token apis, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. The decisive local proof is the intended service receives the request and a success/error response is handled and logged appropriately.

D:

This would verify inspect http status and response body before declaring the exchange successful, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. The decisive local proof is the intended service receives the request and a success/error response is handled and logged appropriately.

Question 716

A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. A targeted trial still reproduces the original gap after the team attempted this change: Use AL HttpClient with an authorized external endpoint and process the HttpResponseMessage. Which repair directly addresses the remaining defect?

  1. Fix credential retrieval and the Authorization header format without exposing secrets in logs
  2. Correct the request construction or outbound-call permission and inspect response status/content on failure
  3. Correct the JSON token traversal and type checks and handle absent optional properties explicitly
  4. Add explicit success-status checks and suitable retry or failure handling for the returned response

Explanation

Correct Answer

B:

Correct the request construction or outbound-call permission and inspect response status/content on failure. This directly addresses the remaining defect for the requirement—A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. It restores the mechanism described here: httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration.

Incorrect Answers

A:

This correction is for the separate condition: A reporting endpoint refuses an AL integration because it is missing its approved API credential header. It would not directly restore the intended behavior in this situation: A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. Here, correct the request construction or outbound-call permission and inspect response status/content on failure, because httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration.

C:

This correction is for the separate condition: A tax service returns structured JSON totals and the extension must extract nested values safely. It would not directly restore the intended behavior in this situation: A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. Here, correct the request construction or outbound-call permission and inspect response status/content on failure, because httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration.

D:

This correction is for the separate condition: An AL HttpClient integration already receives a 400 validation response from the tax service but still records the local order as synchronized. It would not directly restore the intended behavior in this situation: A Business Central extension must call an external shipping service over HTTPS to retrieve current tracking status. Here, correct the request construction or outbound-call permission and inspect response status/content on failure, because httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration.

Question 717

A tax extension must submit a structured request to an authorized external tax engine and read its response. Which single AL development or architecture change best resolves this requirement without redesigning unrelated workflows?

  1. Attach the required authentication header to the outbound HttpRequestMessage or HttpClient request
  2. Parse the response through the AL JSON object, array and token APIs
  3. Inspect HTTP status and response body before declaring the exchange successful
  4. Use AL HttpClient with an authorized external endpoint and process the HttpResponseMessage

Explanation

Correct Answer

D:

This targets the concrete requirement—A tax extension must submit a structured request to an authorized external tax engine and read its response. HttpClient enables outbound HTTP exchanges through supported APIs rather than direct database or host-level integration. The team can establish success when the intended service receives the request and a success/error response is handled and logged appropriately.

Incorrect Answers

A:

This choice primarily fits a different requirement: An external carrier API requires a bearer token on every outbound request from the Business Central extension. There, http authentication headers convey credentials according to the external service's contract rather than as unprotected url query text. In the current situation, A tax extension must submit a structured request to an authorized external tax engine and read its response. HttpClient enables outbound HTTP exchanges through supported APIs rather than direct database or host-level integration. Acceptance requires the intended service receives the request and a success/error response is handled and logged appropriately.

B:

This choice primarily fits a different requirement: A shipping service returns a JSON array of parcels, but AL code treats it as unstructured text and drops identifiers. There, json parsing preserves typed structured fields and nested arrays rather than relying on fragile string matching. In the current situation, A tax extension must submit a structured request to an authorized external tax engine and read its response. HttpClient enables outbound HTTP exchanges through supported APIs rather than direct database or host-level integration. Acceptance requires the intended service receives the request and a success/error response is handled and logged appropriately.

C:

This choice primarily fits a different requirement: An AL HttpClient integration already exchanges requests and responses with an external supplier, but it treats HTTP 429 or 503 responses as success during peak traffic. There, transport completion does not imply application success; the status code and body determine whether the remote operation succeeded. In the current situation, A tax extension must submit a structured request to an authorized external tax engine and read its response. HttpClient enables outbound HTTP exchanges through supported APIs rather than direct database or host-level integration. Acceptance requires the intended service receives the request and a success/error response is handled and logged appropriately.

Question 718

A tax extension must submit a structured request to an authorized external tax engine and read its response. The developer recommends the following change: Use AL HttpClient with an authorized external endpoint and process the HttpResponseMessage. Which technical explanation most directly justifies it in this case?

  1. HttpClient enables outbound HTTP exchanges through supported APIs rather than direct database or host-level integration
  2. HTTP authentication headers convey credentials according to the external service's contract rather than as unprotected URL query text
  3. JSON parsing preserves typed structured fields and nested arrays rather than relying on fragile string matching
  4. Transport completion does not imply application success; the status code and body determine whether the remote operation succeeded

Explanation

Correct Answer

A:

HttpClient enables outbound HTTP exchanges through supported APIs rather than direct database or host-level integration. It connects the proposed action to the exact failure or requirement—A tax extension must submit a structured request to an authorized external tax engine and read its response. Confirmation would be the intended service receives the request and a success/error response is handled and logged appropriately.

Incorrect Answers

B:

That mechanism explains why the alternative action—attach the required authentication header to the outbound httprequestmessage or httpclient request—helps in another case. It does not justify the proposed fix here; httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration. The distinguishing requirement is: A tax extension must submit a structured request to an authorized external tax engine and read its response.

C:

That mechanism explains why the alternative action—parse the response through the al json object, array and token apis—helps in another case. It does not justify the proposed fix here; httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration. The distinguishing requirement is: A tax extension must submit a structured request to an authorized external tax engine and read its response.

D:

That mechanism explains why the alternative action—inspect http status and response body before declaring the exchange successful—helps in another case. It does not justify the proposed fix here; httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration. The distinguishing requirement is: A tax extension must submit a structured request to an authorized external tax engine and read its response.

Question 719

A tax extension must submit a structured request to an authorized external tax engine and read its response. The team implemented a change aligned with this plan: Use AL HttpClient with an authorized external endpoint and process the HttpResponseMessage. Which acceptance result specifically verifies that the reported problem is resolved?

  1. The authorized endpoint accepts the call with a valid credential and rejects a missing or invalid one
  2. The intended service receives the request and a success/error response is handled and logged appropriately
  3. A nested sample payload yields the expected parcel IDs or numeric totals without data loss
  4. Simulated 2xx and error responses follow distinct success, retry or compensating paths without false synchronization

Explanation

Correct Answer

B:

The intended service receives the request and a success/error response is handled and logged appropriately. This is stronger than an unrelated health check because the desired design action is use al httpclient with an authorized external endpoint and process the httpresponsemessage, and httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration. The local requirement is: A tax extension must submit a structured request to an authorized external tax engine and read its response.

Incorrect Answers

A:

This would verify attach the required authentication header to the outbound httprequestmessage or httpclient request, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A tax extension must submit a structured request to an authorized external tax engine and read its response. The decisive local proof is the intended service receives the request and a success/error response is handled and logged appropriately.

C:

This would verify parse the response through the al json object, array and token apis, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A tax extension must submit a structured request to an authorized external tax engine and read its response. The decisive local proof is the intended service receives the request and a success/error response is handled and logged appropriately.

D:

This would verify inspect http status and response body before declaring the exchange successful, which addresses a different engineering need. It does not demonstrate that the current issue is resolved: A tax extension must submit a structured request to an authorized external tax engine and read its response. The decisive local proof is the intended service receives the request and a success/error response is handled and logged appropriately.

Question 720

A tax extension must submit a structured request to an authorized external tax engine and read its response. A targeted trial still reproduces the original gap after the team attempted this change: Use AL HttpClient with an authorized external endpoint and process the HttpResponseMessage. Which repair directly addresses the remaining defect?

  1. Fix credential retrieval and the Authorization header format without exposing secrets in logs
  2. Correct the JSON token traversal and type checks and handle absent optional properties explicitly
  3. Correct the request construction or outbound-call permission and inspect response status/content on failure
  4. Add explicit success-status checks and suitable retry or failure handling for the returned response

Explanation

Correct Answer

C:

Correct the request construction or outbound-call permission and inspect response status/content on failure. This directly addresses the remaining defect for the requirement—A tax extension must submit a structured request to an authorized external tax engine and read its response. It restores the mechanism described here: httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration.

Incorrect Answers

A:

This correction is for the separate condition: A reporting endpoint refuses an AL integration because it is missing its approved API credential header. It would not directly restore the intended behavior in this situation: A tax extension must submit a structured request to an authorized external tax engine and read its response. Here, correct the request construction or outbound-call permission and inspect response status/content on failure, because httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration.

B:

This correction is for the separate condition: A tax service returns structured JSON totals and the extension must extract nested values safely. It would not directly restore the intended behavior in this situation: A tax extension must submit a structured request to an authorized external tax engine and read its response. Here, correct the request construction or outbound-call permission and inspect response status/content on failure, because httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration.

D:

This correction is for the separate condition: An AL HttpClient integration already receives a 400 validation response from the tax service but still records the local order as synchronized. It would not directly restore the intended behavior in this situation: A tax extension must submit a structured request to an authorized external tax engine and read its response. Here, correct the request construction or outbound-call permission and inspect response status/content on failure, because httpclient enables outbound http exchanges through supported apis rather than direct database or host-level integration.


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