305-300 Container Virtualization Practice Question
Which THREE instructions in a Dockerfile can modify the image's filesystem?
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
✓
ADD
RUN, COPY, and ADD all add or modify content within the image layers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
ADD
Why this is correct
Adds files or URLs to the image.
- ✗
ENV
Why it's wrong here
ENV sets environment variables.
- ✗
EXPOSE
Why it's wrong here
EXPOSE modifies metadata, not the filesystem.
- ✓
RUN
Why this is correct
Executes shell commands to add files/tools.
- ✓
COPY
Why this is correct
Copies files from host to the image.
About these practice questions
Courseiva writes every 305-300 question from scratch — 194 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 LPI exam blueprint
This 305-300 practice question is part of Courseiva's free LPI 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 305-300 exam.