CIS-DF Ingest Practice Question
An administrator is designing identification rules for a custom CI class in the CMDB. Which THREE ofg the following best practices should be followed when configuring identification rules? (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
✓
Use attributes that are guaranteed to be unique and immutable, such as serial numbers or hardware asset tags.
Good identification rule design ensures uniqueness, avoids overly broad criteria, and uses reliable hardware attributes like serial numbers or MAC addresses.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use attributes that are guaranteed to be unique and immutable, such as serial numbers or hardware asset tags.
Why this is correct
Unique and immutable attributes prevent false duplicates and accidental record merging.
- ✓
Order identification criteria logically, putting the most reliable and specific rules first.
Why this is correct
The IRE evaluates identification rule entries in order; putting reliable rules first ensures accurate matching efficiency.
- ✗
Ensure that identification rules are created on custom tables without inheriting from cmdb_ci.
Why it's wrong here
All CIs in the CMDB should inherit from cmdb_ci or its standard extensions to maintain CSDM and IRE compatibility.
- ✓
Avoid using volatile attributes like IP address or hostname alone as primary identifiers if devices frequently change networks.
Why this is correct
IP addresses and hostnames change frequently and can lead to incorrect matching or duplicate creation if used standalone.
- ✗
Configure every single attribute of the CI class into a single compound identification rule entry to ensure maximum security.
Why it's wrong here
Putting every attribute into an identification rule makes matching overly restrictive and fragile, often causing unnecessary duplicate creation.
Quick reference
Access Control Model Comparison
| Model | Acronym | Who Controls Access? | Best For |
|---|---|---|---|
| Discretionary Access Control | DAC | Resource owner | Small teams, file shares |
| Mandatory Access Control | MAC | System / security labels | Classified govt / military |
| Role-Based Access Control | RBAC | Administrator (via roles) | Enterprise environments |
| Attribute-Based Access Control | ABAC | Policy engine (user + resource attributes) | Fine-grained, dynamic policies |
| Rule-Based Access Control | RuBAC | System rules / ACLs | Firewall rules, network ACLs |
About these practice questions
Courseiva writes every CIS-DF question from scratch — 320 in total, each with an explanation and a wrong-answer breakdown. None are copied from real exams or 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.