312-85 Intelligence Reporting And Dissemination Practice Question
You are integrating a new threat intelligence platform (TIP). You need to define a 'Custom Object' in STIX 2.1 to track a specific internal project codename associated with threat actors. Which prefix must be used for the custom object name to ensure compatibility and avoid collisions?
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
✓
'x-'
In STIX 2.1, custom objects must be prefixed with 'x-' to identify them as non-standard extensions to the schema.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
'x-'
Why this is correct
The 'x-' prefix is mandatory for custom STIX 2.1 extensions.
- ✗
'ext-'
Why it's wrong here
'ext-' is not the required prefix for custom objects.
- ✗
'c-'
Why it's wrong here
'c-' is not a valid STIX 2.1 prefix for custom objects.
- ✗
'internal-'
Why it's wrong here
'internal-' does not follow the STIX 2.1 convention.
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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 EC-Council exam blueprint
This 312-85 practice question is part of Courseiva's free EC-Council 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 312-85 exam.