MB-920 Describe Dynamics 365 Commerce Practice Question
This MB-920 practice question tests your understanding of describe dynamics 365 commerce. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 the Dynamics 365 Commerce administrator for a retail chain with 50 stores. The company recently deployed the Commerce Scale Unit (CSU) with an onsite database for each store to support offline operations. During a routine check, you notice that one store's CSU database has not synchronized with the headquarters for the past 24 hours, and the store manager reports that some transactions are failing with a 'database connection error'. You verify that the store's internet connection is active and the CSU service is running. However, the Async Client service shows a status of 'Stopped' on the store's POS server. What should you do first to resolve the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Restart the Async Client service on the store's POS server
The Async Client service is responsible for synchronizing data between the store's Commerce Scale Unit (CSU) and the headquarters. When this service is in a 'Stopped' state, it cannot process the Commerce Data Exchange (CDX) jobs that push transactions and pull master data, causing the database to fall out of sync and leading to transaction failures due to stale or missing data. Restarting the Async Client service is the immediate corrective action because it re-establishes the communication channel without requiring reconfiguration or reinstallation.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Restart the Async Client service on the store's POS server
Why this is correct
Restarting the service will resume the sync process and likely clear the error.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a new Commerce Data Exchange session in the back office
Why it's wrong here
Creating a new session is not the immediate fix; the service needs to be running.
✗
Reconfigure the Async Client endpoint URLs in the CSU configuration
Why it's wrong here
The URLs are likely correct since the service worked before; this is more of a service restart issue.
✗
Reinstall the Commerce Scale Unit on the store's server
Why it's wrong here
Reinstalling is drastic and not necessary; the issue is a stopped service.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume a network or configuration issue (options C or D) because the internet is active and the CSU is running, but the specific symptom of a stopped Async Client service directly points to a local service failure that requires a restart, not a deeper infrastructure change.
Detailed technical explanation
How to think about this question
The Async Client service is a Windows service (CommerceAsyncClient) that runs on the store's POS server and manages the outbound and inbound CDX jobs. It uses a polling mechanism to check for new jobs from the headquarters via the Commerce Data Exchange: Real-time Service, and when stopped, the store's CSU database becomes stale, causing POS terminals to fail with 'database connection error' because they rely on synchronized data for operations like price lookups and inventory checks. In a real-world scenario, a simple service restart resolves the issue in under a minute, whereas reinstallation could take hours and risk data loss.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Describe Dynamics 365 Commerce — This question tests Describe Dynamics 365 Commerce — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Restart the Async Client service on the store's POS server — The Async Client service is responsible for synchronizing data between the store's Commerce Scale Unit (CSU) and the headquarters. When this service is in a 'Stopped' state, it cannot process the Commerce Data Exchange (CDX) jobs that push transactions and pull master data, causing the database to fall out of sync and leading to transaction failures due to stale or missing data. Restarting the Async Client service is the immediate corrective action because it re-establishes the communication channel without requiring reconfiguration or reinstallation.
What should I do if I get this MB-920 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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