CIS-DF Configuration Practice Question
An enterprise is designing a complex class hierarchy for IoT devices. They decide to create a multi-level extension: cmdb_ci > cmdb_ci_hardware > cmdb_ci_compute > cmdb_ci_iot. What happens to the table inheritance and record storage when a new record is inserted into cmdb_ci_iot?
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
✓
The record is stored in the cmdb_ci_iot table, and database views or UNION queries allow parent tables to display the record.
ServiceNow extends tables using database extension, meaning records are stored in the specific leaf table (cmdb_ci_iot) while parent tables hold corresponding records for polymorphic queries.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
All attributes are stored in a single flat cmdb_ci table with discriminator columns.
Why it's wrong here
ServiceNow uses separate physical database tables for extended classes rather than a single flat table.
- ✗
The platform throws an error because more than two levels of extension are prohibited in the CMDB.
Why it's wrong here
ServiceNow supports multiple levels of table extension within the CMDB hierarchy.
- ✓
The record is stored in the cmdb_ci_iot table, and database views or UNION queries allow parent tables to display the record.
Why this is correct
Each extended class has its own table, and queries on parent tables automatically union records from child tables.
- ✗
Records are stored exclusively in the cmdb_ci table, and child tables only store metadata.
Why it's wrong here
Child tables store the actual record data specific to their attributes and inherited fields.
About these practice questions
This CIS-DF question is part of Courseiva's 320-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
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.