This CV0-004 practice question tests your understanding of deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 THREE of the following are best practices for deploying applications in a cloud environment? (Choose three.)
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use immutable infrastructure patterns.
Immutable infrastructure patterns (A) are a best practice because they ensure that once a server or container is deployed, it is never modified in place. Instead, any change requires building a new instance from a golden image or template, which eliminates configuration drift and makes rollbacks trivial. This approach aligns with cloud-native principles where infrastructure is treated as disposable and version-controlled, reducing the risk of snowflake servers and improving reliability.
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.
✓
Use immutable infrastructure patterns.
Why this is correct
Immutable infrastructure ensures consistency and security.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Design for horizontal scaling rather than vertical.
Why this is correct
Horizontal scaling increases resilience and leverages cloud elasticity.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Open all ports in security groups to simplify connectivity.
Why it's wrong here
Security best practice is to restrict ports.
✗
Keep unused resources to avoid reprovisioning delays.
Why it's wrong here
Unused resources incur cost and management overhead.
✓
Implement blue/green deployment to minimize downtime.
Why this is correct
Blue/green allows zero-downtime updates.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that 'keeping unused resources avoids delays' (D) is a valid cost-saving strategy, when in fact cloud environments are designed for rapid provisioning from images or snapshots, making idle resources an unnecessary expense and security risk.
Detailed technical explanation
How to think about this question
Horizontal scaling (B) distributes load across multiple instances behind a load balancer (e.g., AWS ALB or Azure Load Balancer), allowing near-linear capacity increases and fault tolerance, whereas vertical scaling hits hardware limits and causes downtime during resizing. Blue/green deployment (E) maintains two identical environments (blue = current, green = new) and switches traffic at the load balancer level, enabling instant rollback by reverting DNS or routing rules; this technique is commonly implemented with AWS CodeDeploy or Kubernetes Service selectors. Immutable infrastructure (A) is often realized through tools like Packer for image creation and Terraform for declarative provisioning, ensuring every deployment is a fresh, consistent environment.
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use immutable infrastructure patterns. — Immutable infrastructure patterns (A) are a best practice because they ensure that once a server or container is deployed, it is never modified in place. Instead, any change requires building a new instance from a golden image or template, which eliminates configuration drift and makes rollbacks trivial. This approach aligns with cloud-native principles where infrastructure is treated as disposable and version-controlled, reducing the risk of snowflake servers and improving reliability.
What should I do if I get this CV0-004 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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