The answer is domain separation and separate tables for each company. Domain separation is ServiceNow’s native mechanism for multi-tenant data isolation, automatically partitioning records by domain so users only see data within their assigned domain. Creating separate tables per company physically isolates data at the database schema level, preventing any cross-tenant access even if queries or ACLs are misconfigured. On the Certified Application Developer exam, this question tests your understanding that architectural isolation—not just access control—is required for true multi-tenant security. A common trap is choosing ACLs alone, but they rely on correct coding and can be bypassed; database views and query conditions similarly lack enforcement. Remember the mnemonic “Dome and Table” to recall that Domain separation and separate Tables are the two approved strategies for guaranteed data isolation.
SNOW-CAD Working with Data Practice Question
This SNOW-CAD practice question tests your understanding of working with data. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 developer is designing a data architecture for a multi-tenant environment where each company's data must be isolated. Which TWO strategies can achieve this? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Implement domain separation.
Options B and E are correct. Using domain separation provides built-in data isolation. Creating separate tables per company physically isolates data. Option A is wrong because ACLs alone can be complex and may not fully isolate. Option C is wrong because database views do not enforce isolation. Option D is wrong because conditions on queries rely on correct coding, not architecture.
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.
✓
Implement domain separation.
Why this is correct
Domain separation natively partitions data by domain.
Related concept
Standard ACLs match source addresses.
✗
Use access control lists (ACLs) on each record.
Why it's wrong here
ACLs can provide security but may not prevent all cross-tenant data access if misconfigured.
✗
Create database views that filter data by company.
Why it's wrong here
Views do not enforce data isolation at the application layer.
✗
Add a condition to every GlideRecord query to filter by company.
Why it's wrong here
Requires strict adherence by all developers; not architectural.
✓
Use separate tables for each company.
Why this is correct
Physical separation ensures data is completely isolated.
Related concept
Standard ACLs match source addresses.
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.
Working with Data — This question tests Working with Data — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Implement domain separation. — Options B and E are correct. Using domain separation provides built-in data isolation. Creating separate tables per company physically isolates data. Option A is wrong because ACLs alone can be complex and may not fully isolate. Option C is wrong because database views do not enforce isolation. Option D is wrong because conditions on queries rely on correct coding, not architecture.
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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