JNCIA-DevOps Data Serialization Practice Question
Which of the following primitive data types is NOT supported natively in JSON?
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
✓
Undefined
JSON does not support undefined, functions, or undefined date types natively. Among standard choices, undefined or complex numbers are absent.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Undefined
Why this is correct
Correct. 'undefined' is a JavaScript concept and is not supported in JSON (which uses 'null').
- ✗
Number
Why it's wrong here
Incorrect. Numbers are natively supported in JSON.
- ✗
String
Why it's wrong here
Incorrect. Strings are natively supported in JSON.
- ✗
Null
Why it's wrong here
Incorrect. Null is natively supported in JSON.
About these practice questions
One of 306 original JNCIA-DevOps practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. 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 Juniper Networks exam blueprint
This JNCIA-DevOps practice question is part of Courseiva's free Juniper Networks 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 JNCIA-DevOps exam.