Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company is designing a highly available application on AWS. The architect plans to deploy application instances across multiple Availability Zones and implement health checks to automatically route traffic away from failed instances. These design decisions primarily contribute to which pillar of the AWS Well-Architected Framework?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Operational Excellence
Operational Excellence is the pillar that focuses on running workloads effectively, gaining insight into their operation, and continuously improving processes. While health checks and automated responses can support operational practices, the primary goal of multi-AZ deployment and health-based routing is to ensure the workload remains available despite failures, which is a reliability concern, not an operational excellence one.
B
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Security
The Security pillar focuses on protecting data, systems, and assets through identity and access management, detective controls, infrastructure protection, data protection, and incident response. Deploying across multiple Availability Zones does not directly address security; it addresses availability and fault tolerance, which fall under the Reliability pillar.
C
Best answer
Reliability
Correct. The Reliability pillar encompasses the ability of a workload to recover from infrastructure or service failures, dynamically acquire computing resources to meet demand, and mitigate disruptions. Deploying across multiple Availability Zones and using health checks with automatic failover are fundamental reliability techniques that ensure the application continues to operate when single components fail.
D
Distractor review
Performance Efficiency
The Performance Efficiency pillar focuses on using computing resources efficiently to meet system requirements and maintain efficiency as demand changes. This includes selecting the right resource types and sizes, monitoring performance, and making trade-offs. Multi-AZ deployment and health checks are not primarily about efficiency; they are about ensuring continued operation during failures, which is a reliability concern.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer needs to launch a test server for a new application prototype. The developer logs into the AWS Management Console, selects an Amazon EC2 instance type, configures the security group, and starts the instance. The instance is running within two minutes, and the developer did not need to submit a formal request to the company's IT procurement team or wait for approval from a cloud administrator. Which essential characteristic of cloud computing does this scenario best demonstrate?
Question 2
A solutions architect is planning a new web application on AWS. The workload will include 3 Amazon EC2 instances (t3.medium) running 24/7, an Application Load Balancer, and an Amazon RDS for MySQL db.t3.small database. The architect needs to estimate the monthly cost for the first year, considering different purchasing options (On-Demand, 1-year All Upfront Reserved Instance, and Compute Savings Plan). Which AWS tool should the architect use to create this estimate?
Question 3
A company's development team frequently needs temporary test environments. A developer can log into the AWS Management Console, select an Amazon EC2 instance type, configure storage, and launch the instance within minutes without any interaction with the IT infrastructure team. This capability is an example of which essential characteristic of cloud computing?
Question 4
A company's finance team needs to analyze AWS spending in detail. They require a report that includes hourly cost data for each AWS service, each individual resource (e.g., a specific EC2 instance), and any cost allocation tags applied. The team plans to export this data to an Amazon S3 bucket and then import it into a custom business intelligence (BI) analytics dashboard. Which AWS tool should the finance team use to generate this level of detailed cost data?
Question 5
A company uses AWS for its development environment. The finance team wants to set a monthly budget of $10,000. They want to receive an email notification when the actual costs reach 80% of the budget ($8,000) and again when costs exceed the budget. The team needs a managed AWS service that can automatically send these alerts without requiring custom code or third-party tools. Which AWS service should the team use?
Question 6
A company uses AWS Organizations to manage multiple accounts. The security team needs to enforce a policy that restricts SSH access (port 22) from the internet (0.0.0.0/0) in all VPCs across all accounts. The team wants to centrally define the allowed rules and automatically apply them to newly created VPCs and security groups, while also automatically remediating any existing non-compliant security groups. Which AWS service should the team use?
FAQ
Questions learners often ask
What does this CLF-C02 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: Reliability — The AWS Well-Architected Framework has five pillars: Operational Excellence, Security, Reliability, Performance Efficiency, and Cost Optimization. The Reliability pillar focuses on ensuring that a workload performs its intended function correctly and consistently when it's expected to. This includes the ability to recover from infrastructure or service disruptions, dynamically acquire computing resources to meet demand, and mitigate disruptions such as misconfigurations or transient network issues. Deploying across multiple Availability Zones and using health checks with automatic failover are core reliability design patterns. The other pillars address different concerns: Operational Excellence focuses on running and monitoring systems to deliver business value; Security protects data and systems; Performance Efficiency uses computing resources efficiently; Cost Optimization avoids unnecessary costs.
What should I do if I get this CLF-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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