JNCIA-DevOps Data Serialization Practice Question
An automation engineer writes a Python script that reads a Junos configuration file serialized in JSON. The file opens successfully, but parsing fails with a JSONDecodeError due to trailing commas at the end of object lists. How does standard JSON handle trailing commas compared to YAML?
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
✓
JSON strictly forbids trailing commas, whereas YAML permits them in collections.
Standard JSON strictly prohibits trailing commas in objects and arrays, whereas YAML is much more lenient and allows trailing commas in sequences and mappings.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
JSON strictly forbids trailing commas, whereas YAML permits them in collections.
Why this is correct
Correct. JSON syntax rules do not allow trailing commas, while YAML parsers accommodate them.
- ✗
Both formats handle trailing commas identically by ignoring them.
Why it's wrong here
Incorrect. JSON parsers raise an error on trailing commas.
- ✗
JSON allows trailing commas, but YAML strictly forbids them.
Why it's wrong here
Incorrect. This is the exact opposite; JSON forbids trailing commas.
- ✗
Both JSON and YAML strictly require trailing commas for every key.
Why it's wrong here
Incorrect. Neither format requires trailing commas.
About these practice questions
This JNCIA-DevOps question is part of Courseiva's 307-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 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.