- A
Active-passive with a standby instance in a different region
Why wrong: Active-passive with cross-region fails over to a different region, not within the same region across AZs.
- B
Active-active across availability zones with a load balancer
Active-active across AZs with a load balancer provides automatic failover within the region.
- C
Vertical scaling of instances in a single availability zone
Why wrong: Vertical scaling does not provide HA across AZs.
- D
Cold standby with daily backups
Why wrong: Cold standby has long RTO and requires manual intervention.
Question 843 of 997
CV0-004 Cloud Architecture and Design Practice Question
This CV0-004 practice question tests your understanding of cloud architecture and design. 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.
A cloud architect is deploying a web application across multiple availability zones within a single region to achieve high availability. The application requires that if one availability zone fails, traffic should automatically be rerouted to the remaining zones without manual intervention. Which configuration is required?
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
✓
Active-active across availability zones with a load balancer
Option B is correct because deploying an active-active configuration across multiple availability zones with a load balancer ensures that traffic is automatically distributed to healthy instances. If one availability zone fails, the load balancer's health checks detect the failure and reroute traffic to the remaining zones without manual intervention, meeting the high availability requirement.
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.
- ✗
Active-passive with a standby instance in a different region
Why it's wrong here
Active-passive with cross-region fails over to a different region, not within the same region across AZs.
- ✓
Active-active across availability zones with a load balancer
Why this is correct
Active-active across AZs with a load balancer provides automatic failover within the region.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Vertical scaling of instances in a single availability zone
Why it's wrong here
Vertical scaling does not provide HA across AZs.
- ✗
Cold standby with daily backups
Why it's wrong here
Cold standby has long RTO and requires manual intervention.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse high availability with disaster recovery, mistakenly choosing a cross-region active-passive setup (Option A) when the question explicitly specifies a single region and automatic rerouting.
Detailed technical explanation
How to think about this question
Under the hood, the load balancer (e.g., AWS Application Load Balancer or Azure Load Balancer) uses health checks (e.g., HTTP/HTTPS probes or TCP pings) to monitor instance health in each availability zone. When a zone fails, the load balancer's routing algorithm (e.g., round-robin or least outstanding requests) automatically stops sending traffic to the failed targets, and DNS-based routing (e.g., Route 53 with latency or weighted records) can further assist. In a real-world scenario, this design is critical for meeting SLAs like 99.99% uptime, as it tolerates AZ failures without requiring DNS TTL propagation delays.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this CV0-004 question test?
Cloud Architecture and Design — This question tests Cloud Architecture and Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Active-active across availability zones with a load balancer — Option B is correct because deploying an active-active configuration across multiple availability zones with a load balancer ensures that traffic is automatically distributed to healthy instances. If one availability zone fails, the load balancer's health checks detect the failure and reroute traffic to the remaining zones without manual intervention, meeting the high availability requirement.
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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