Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company is migrating a legacy monolithic e-commerce application to AWS. The application has three tightly integrated modules: user authentication, payment processing, and inventory management. In the current design, a failure in the payment processing module often causes the entire application to crash. The company wants to redesign the application so that each module runs independently, and a failure in one module does not cascade to other modules. Which cloud computing concept should the company apply to achieve this goal?
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
Elasticity
Elasticity is the ability to automatically provision and de-provision compute resources as demand changes. It does not address how independent components interact or fail, so it does not prevent cascading failures between modules.
B
Distractor review
High availability
High availability ensures that a system remains operational even during infrastructure failures, such as an Availability Zone outage, by using redundant resources. While it improves overall uptime, it does not isolate failures within the application architecture; a single module failure could still bring down tightly coupled components.
C
Best answer
Loose coupling
Loose coupling is an architectural principle where components are designed to have minimal dependencies on each other. They communicate asynchronously (e.g., via queues, events, or APIs) so that a failure in one component does not cascade to others. This approach directly solves the company's problem of isolating module failures.
D
Distractor review
Disaster recovery
Disaster recovery refers to plans and processes for restoring IT infrastructure and data after a catastrophic event (e.g., natural disaster, large-scale outage). It is not a daily resilience pattern for preventing cascading failures between application modules.
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: Loose coupling — The company needs to prevent failures from cascading between independently functioning modules. This is the principle of loose coupling, where components are designed to have minimal dependencies on each other, typically communicating via well-defined interfaces, message queues, or APIs. Loose coupling increases resilience because a failure in one component does not automatically cause failures in others. Elasticity (option A) refers to the ability to automatically scale resources up or down based on demand, not to component isolation. High availability (option B) focuses on keeping a system operational across multiple Availability Zones, but does not inherently prevent cascading failures within the application architecture. Disaster recovery (option D) is a set of policies and procedures for recovering from a large-scale catastrophic event, not a daily architectural pattern for resilience.
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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