MB-920 Practice Question: Describe the core capabilities of the finance and operations apps
This MB-920 practice question tests your understanding of describe the core capabilities of the finance and operations apps. 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.
A retail company using Dynamics 365 Commerce is experiencing slow performance in the point of sale (POS) system during peak hours. The company uses a hybrid deployment with on-premises back-office and cloud-based POS. What is the most likely cause of the performance issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Network latency between on-premises and cloud environments
In a hybrid deployment where the on-premises back-office handles data processing and the cloud-based POS relies on real-time communication, network latency between the two environments is the most likely cause of slow performance during peak hours. The POS system must send requests (e.g., inventory lookups, transaction processing) to the on-premises back-office over the internet, and high latency or packet loss can significantly degrade response times, especially under heavy load.
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.
✗
On-premises data center overload
Why it's wrong here
The back-office is on-premises, but the POS is cloud-based; the bottleneck is likely the network.
✓
Network latency between on-premises and cloud environments
Why this is correct
High latency during peak hours can cause slowdowns when the POS system needs to communicate with the on-premises back-office.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Incorrect POS hardware profile configuration
Why it's wrong here
Hardware profile configuration is static and unlikely to cause intermittent peak-hour issues.
✗
Insufficient POS terminal memory
Why it's wrong here
The issue occurs only during peak hours, suggesting a network or server load issue rather than local hardware.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume on-premises data center overload (Option A) is the cause, overlooking that the POS is cloud-based and the bottleneck is the network link between environments, not the back-office server's processing capacity.
Detailed technical explanation
How to think about this question
Dynamics 365 Commerce POS uses the Commerce Runtime (CRT) and Real-time Service to communicate with the back-office via SOAP/HTTP calls. During peak hours, increased transaction volume amplifies the impact of network latency, as each POS operation may require multiple round trips (e.g., for price checks, inventory availability, and payment authorization). A latency of even 100-200ms per call can accumulate to several seconds per transaction, which is often misattributed to other factors.
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
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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 the core capabilities of the finance and operations apps — This question tests Describe the core capabilities of the finance and operations apps — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Network latency between on-premises and cloud environments — In a hybrid deployment where the on-premises back-office handles data processing and the cloud-based POS relies on real-time communication, network latency between the two environments is the most likely cause of slow performance during peak hours. The POS system must send requests (e.g., inventory lookups, transaction processing) to the on-premises back-office over the internet, and high latency or packet loss can significantly degrade response times, especially under heavy load.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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