- A
Scale down the blue environment before traffic is switched
Why wrong: Scaling down before switching would cause downtime if the green environment fails.
- B
Deploy a canary release that sends 10% of traffic to green first
Why wrong: That describes a canary deployment, not blue/green.
- C
Update the load balancer target group to point to the green environment
Correct. Changing the load balancer routing effectively shifts traffic.
- D
Modify the DNS TTL to 0 and update A records
Why wrong: DNS changes can be used but are not as immediate as load balancer updates; they can cause propagation delays.
Question 58 of 997
CV0-004 Deployment Practice Question
This CV0-004 practice question tests your understanding of deployment. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A company wants to deploy a new version of a web application with zero downtime. They decide to use a blue/green deployment strategy. Which action is essential to switching traffic from the blue environment to the green environment?
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
✓
Update the load balancer target group to point to the green environment
In a blue/green deployment, the load balancer is the traffic router. Updating the load balancer target group to point to the green environment is essential because it instantly shifts production traffic from the blue (current) to the green (new) environment without downtime. This action ensures the load balancer forwards requests to the healthy green targets, completing the cutover.
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.
- ✗
Scale down the blue environment before traffic is switched
Why it's wrong here
Scaling down before switching would cause downtime if the green environment fails.
- ✗
Deploy a canary release that sends 10% of traffic to green first
Why it's wrong here
That describes a canary deployment, not blue/green.
- ✓
Update the load balancer target group to point to the green environment
Why this is correct
Correct. Changing the load balancer routing effectively shifts traffic.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Modify the DNS TTL to 0 and update A records
Why it's wrong here
DNS changes can be used but are not as immediate as load balancer updates; they can cause propagation delays.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between DNS-based traffic switching (which has propagation delays and is not instantaneous) and load balancer target group updates (which provide immediate, atomic traffic shifting), leading candidates to incorrectly choose DNS modifications for zero-downtime blue/green deployments.
Detailed technical explanation
How to think about this question
Under the hood, the load balancer target group maintains a health check state for each registered target. When the target group is updated to point to the green environment's instances, the load balancer immediately begins routing new connections to those instances, provided they pass health checks. A subtle behavior is that existing connections to the blue environment are not terminated; they drain naturally based on connection timeout or idle timeout settings, which is why a proper connection draining configuration is critical to avoid dropped sessions during the cutover.
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 practitioner preparing for the CV0-004 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this CV0-004 question test?
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: Update the load balancer target group to point to the green environment — In a blue/green deployment, the load balancer is the traffic router. Updating the load balancer target group to point to the green environment is essential because it instantly shifts production traffic from the blue (current) to the green (new) environment without downtime. This action ensures the load balancer forwards requests to the healthy green targets, completing the cutover.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
This CV0-004 practice question is part of Courseiva's free CompTIA 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 CV0-004 exam.
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