Quick Answer
The answer is eliminating single points of failure, implementing health checks and auto-recovery, and designing for redundancy and fault tolerance. These three design principles are fundamental to building a highly available cloud architecture because they ensure that no single component failure can cause a complete outage. Eliminating single points of failure requires deploying redundant resources—such as multiple load balancers in active-passive or active-active configurations—so traffic can be rerouted if one fails. Health checks and auto-recovery then monitor those resources and automatically replace or restart unhealthy instances, while redundancy and fault tolerance distribute workloads across availability zones to absorb failures. On the CompTIA Cloud+ CV0-004 exam, this topic tests your ability to distinguish foundational HA principles from secondary considerations like cost optimization or performance tuning. A common trap is confusing scalability with availability—scaling adds capacity, but without redundancy and health checks, a single failure still brings the system down. Remember the mnemonic “RHR” for Redundancy, Health checks, and Recovery to lock in the three core principles.
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.
Which THREE design principles are fundamental to building a highly available cloud architecture?
Eliminate single points of failure
Critical for high availability.
Deploy across multiple availability zones
Protects against zone failure.
Implement health checks and auto-recovery
Automatically replaces failed components.
Scale vertically to increase capacity
Why wrong: Vertical scaling has limits and single point of failure.
Use a single, powerful database instance
Why wrong: Creates a single point of failure.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Eliminate single points of failure
Eliminating single points of failure (A) is fundamental because if any single component (e.g., a load balancer, a storage volume, or a compute instance) fails, the entire system can become unavailable. In cloud architectures, this is achieved by deploying redundant components so that no single failure can cause a complete outage. For example, using multiple load balancers in an active-passive or active-active configuration ensures traffic can still be routed if one fails.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Eliminate single points of failure
Why this is correct
Critical for high availability.
Related concept
Read the scenario before looking for a memorised answer.
Deploy across multiple availability zones
Why this is correct
Protects against zone failure.
Related concept
Read the scenario before looking for a memorised answer.
Implement health checks and auto-recovery
Why this is correct
Automatically replaces failed components.
Related concept
Read the scenario before looking for a memorised answer.
Scale vertically to increase capacity
Why it's wrong here
Vertical scaling has limits and single point of failure.
Use a single, powerful database instance
Why it's wrong here
Creates a single point of failure.
Common exam traps
CompTIA often tests the misconception that vertical scaling (Option D) is a valid high-availability strategy, when in reality it only addresses capacity and not fault tolerance, and that a single powerful database (Option E) can be made highly available through backups alone, ignoring the need for real-time replication and automatic failover.
Detailed technical explanation
Highly available cloud architectures rely on redundancy at every layer, often implemented through auto-scaling groups that span multiple availability zones, health checks (e.g., HTTP/HTTPS or TCP probes) that trigger automated failover, and stateless application design. For instance, AWS Elastic Load Balancing uses cross-zone load balancing and health checks to route traffic only to healthy instances, while Amazon RDS Multi-AZ automatically replicates data synchronously to a standby instance in a different AZ for automatic failover. The key is that each component must be designed to fail independently without cascading effects.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Cloud Architecture and Design — This question tests Cloud Architecture and Design — Read the scenario before looking for a memorised answer..
The correct answer is: Eliminate single points of failure — Eliminating single points of failure (A) is fundamental because if any single component (e.g., a load balancer, a storage volume, or a compute instance) fails, the entire system can become unavailable. In cloud architectures, this is achieved by deploying redundant components so that no single failure can cause a complete outage. For example, using multiple load balancers in an active-passive or active-active configuration ensures traffic can still be routed if one fails.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 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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