The answer is that the UI Policy is set to run only on the server and not on the client. This is the most likely reason because UI Policies execute server-side logic when the form loads, but client-side mandatory validation requires the policy to also set the mandatory attribute on the client copy of the field. If the “Run on” property is configured for the server only, the client never receives the instruction to enforce the mandatory rule, so the field remains optional until submission fails server-side. On the ServiceNow Certified Application Developer CAD exam, this question tests your understanding of UI Policy execution contexts and the distinction between server-side and client-side behavior. A common trap is confusing UI Policies with Client Scripts, which can set mandatory client-side but are not the standard mechanism for conditional mandatory fields. Remember the memory tip: “Server sets the rule, client enforces the rule—if the client doesn’t know, the rule won’t show.”
SNOW-CAD User Interface Development Practice Question
This SNOW-CAD practice question tests your understanding of user interface development. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 form has a UI Policy that conditionally makes a field mandatory. The UI Policy works on the server side but the mandatory validation is not enforced on the client side before submission. What is the most likely reason?
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
✓
The UI Policy is set to run only on the server and not on the client.
Option C is correct because UI Policies execute on the server when the form is loaded, but client-side mandatory validation requires the UI Policy to set the mandatory attribute on the client copy. If the policy is set to run only on the server, the client does not enforce it. Option A is wrong because client scripts can set mandatory but are not the standard way. Option B is wrong because ACLs control access, not mandatory. Option D is wrong because the form load order is usually correct.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The field's ACL does not allow the user to see it.
Why it's wrong here
ACLs do not control mandatory enforcement.
✓
The UI Policy is set to run only on the server and not on the client.
Why this is correct
UI Policies must have the 'Run on client' checkbox enabled to enforce mandatory client-side.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The form is in a different ordering of UI Policies.
Why it's wrong here
Order matters but not as likely as the client-side execution setting.
✗
A client script is overriding the mandatory property.
Why it's wrong here
A client script could override, but the most common cause is the UI Policy not running client-side.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SNOW-CAD ACL questions on filtering logic and placement.
User Interface Development — This question tests User Interface Development — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The UI Policy is set to run only on the server and not on the client. — Option C is correct because UI Policies execute on the server when the form is loaded, but client-side mandatory validation requires the UI Policy to set the mandatory attribute on the client copy. If the policy is set to run only on the server, the client does not enforce it. Option A is wrong because client scripts can set mandatory but are not the standard way. Option B is wrong because ACLs control access, not mandatory. Option D is wrong because the form load order is usually correct.
What should I do if I get this SNOW-CAD question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SNOW-CAD ACL questions on filtering logic and placement.
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?
Standard ACLs match source addresses.
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