JNCIA-DevOps Data Serialization Practice Question
An engineer writes a Python script that loads a JSON configuration file using the json.load() method. The file contains configuration parameters for a Junos device. If the JSON file contains a trailing comma at the end of the last element in an array, what will happen when the script executes?
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 script will raise a JSONDecodeError.
Standard JSON specification is strict and does not allow trailing commas. Attempting to parse it will raise a json.decoder.JSONDecodeError.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The script will successfully parse the file and ignore the trailing comma.
Why it's wrong here
Python's standard json parser does not permit trailing commas.
- ✓
The script will raise a JSONDecodeError.
Why this is correct
Trailing commas violate standard JSON syntax rules, causing the parser to fail with a decode error.
- ✗
The script will throw a TypeError during execution.
Why it's wrong here
The error occurs during decoding, resulting in a JSONDecodeError rather than a TypeError.
- ✗
The script will convert the trailing comma into a null value automatically.
Why it's wrong here
Parsers do not automatically convert syntax errors into null values.
About these practice questions
One of 307 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.