PCD Building and testing applications Practice Question
This PCD practice question tests your understanding of building and testing applications. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which TWO statements about building container images for Google Cloud Run are correct? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The container must respond to health checks on the same port as the main application.
Option B is correct because Cloud Run requires the container to respond to health checks (e.g., HTTP GET /health) on the same port as the main application. Cloud Run uses the same port for both user requests and health check probes; if the health check fails, the container is restarted. This ensures the container is always ready to serve traffic.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 container must use HTTP/1.1; HTTP/2 is not supported.
The container must respond to health checks on the same port as the main application.
Why this is correct
Health checks are sent to the container's port; the app must respond with 200 OK.
Related concept
Read the scenario before looking for a memorised answer.
✓
The container must be stateless and not rely on local file system persistence.
Why this is correct
Cloud Run is stateless; any local file system writes are ephemeral.
Related concept
Read the scenario before looking for a memorised answer.
✗
The container must listen on port 8080 by default.
Why it's wrong here
The container must listen on the port defined by the PORT environment variable, which is 8080 by default but can be changed.
✗
The container must run as root user.
Why it's wrong here
Cloud Run recommends running as non-root for security.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that Cloud Run mandates port 8080 or requires HTTP/1.1, but the actual requirement is that the container must respond to health checks on the same port as the main application and must be stateless.
Detailed technical explanation
How to think about this question
Under the hood, Cloud Run uses the Knative Serving API, which injects the PORT environment variable into the container at runtime. Health checks are performed via HTTP GET requests to the root path (/) or a custom path defined in the container's readiness probe, and they must succeed on the same port as the application. A common real-world scenario is when a container listens on port 3000 internally but fails to bind to the PORT variable, causing the health check to fail and the container to be terminated.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Building and testing applications — This question tests Building and testing applications — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The container must respond to health checks on the same port as the main application. — Option B is correct because Cloud Run requires the container to respond to health checks (e.g., HTTP GET /health) on the same port as the main application. Cloud Run uses the same port for both user requests and health check probes; if the health check fails, the container is restarted. This ensures the container is always ready to serve traffic.
What should I do if I get this PCD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This PCD practice question is part of Courseiva's free Google Cloud 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 PCD exam.
Question Discussion
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