CIS-DF Configuration Practice Question
Your organization is designing a custom subclass for specialized network appliances that require unique attributes not found in the standard cmdb_ci_netgear class. When creating a custom CI class extending cmdb_ci, what is the best practice recommendation regarding table extension?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Extend from the most specific existing parent class that shares the common attributes of the new CI type.
Extending from the most specific parent class that fits your data model ensures you inherit existing attributes and relationships without redundant configuration.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a standalone table independent of the CMDB hierarchy and link it via business rules.
Why it's wrong here
Standalone tables break core CMDB functionality, reporting, and CSDM alignment.
- ✓
Extend from the most specific existing parent class that shares the common attributes of the new CI type.
Why this is correct
Extending the most specific appropriate class maximizes inheritance and maintains standard class hierarchy design.
- ✗
Extend from cmdb_rel_ci to automatically inherit relationship capabilities.
Why it's wrong here
cmdb_rel_ci is a relationship table, not a CI class table.
- ✗
Always extend directly from cmdb to avoid table bloat and performance degradation.
Why it's wrong here
Extending directly from cmdb bypasses standard hardware attributes and relationships inherent in cmdb_ci_hardware.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official ServiceNow exam blueprint
This CIS-DF practice question is part of Courseiva's free ServiceNow certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CIS-DF exam.