CIS-DF Configuration Practice Question
When designing class hierarchy extensions in the CMDB, which THREE best practices should an implementation specialist follow? (Choose three.)
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
✓
Avoid excessively deep class hierarchies unless justified by distinct identification or attribute requirements.
Best practices include subclassing from appropriate existing parents, avoiding unnecessary deep hierarchies, and reusing existing attributes before creating custom ones.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Avoid excessively deep class hierarchies unless justified by distinct identification or attribute requirements.
Why this is correct
Deep hierarchies can complicate queries and maintenance without added value.
- ✗
Bypass the CI Class Manager and create database tables directly in System Definition.
Why it's wrong here
Creating tables in System Definition bypasses CMDB class governance, identification rules, and metadata setup.
- ✓
Subclass from the most specific existing parent class that shares the same attributes and behaviors.
Why this is correct
Leveraging existing parent classes ensures proper inheritance of attributes and rules.
- ✗
Create a brand new base table directly under cmdb for every new hardware vendor.
Why it's wrong here
Creating custom base tables directly under cmdb isolates CIs and breaks standard hardware inheritance.
- ✓
Check for existing out-of-the-box attributes before creating custom attributes to prevent redundancy.
Why this is correct
Reusing standard attributes maintains compatibility with Discovery and CSDM models.
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.