Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company runs a web application on multiple Amazon EC2 instances that are behind an Application Load Balancer. The operations team wants to ensure that if any EC2 instance fails, a new instance is automatically launched to replace it and maintain a minimum number of running instances. Which AWS service should the company use to meet this requirement?
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
AWS Elastic Load Balancing
Elastic Load Balancing distributes incoming traffic across multiple targets, such as EC2 instances, but it does not automatically launch new instances to replace failed ones. It can perform health checks and route traffic away from unhealthy instances, but replacement is not its function.
B
Best answer
Amazon EC2 Auto Scaling
Amazon EC2 Auto Scaling is the correct service. It automatically adds or removes EC2 instances based on defined policies or to maintain a desired capacity. If an instance fails, Auto Scaling detects the decrease in healthy capacity and launches a new instance to replace it, ensuring the application remains available.
C
Distractor review
AWS Lambda
AWS Lambda is a serverless compute service that runs code in response to events, without provisioning or managing servers. It is not designed to manage EC2 instance lifecycles or automatically replace failed instances.
D
Distractor review
AWS Auto Scaling
AWS Auto Scaling is a service that helps you scale multiple AWS resources, including EC2 instances, DynamoDB tables, and Aurora replicas, using scaling plans. However, the specific service that directly manages EC2 instance replacement and desired capacity is Amazon EC2 Auto Scaling. AWS Auto Scaling provides a unified interface for scaling across resources, but for the described scenario, Amazon EC2 Auto Scaling is the appropriate service.
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: Amazon EC2 Auto Scaling — Amazon EC2 Auto Scaling is the AWS service that automatically launches or terminates EC2 instances to maintain a specified number of healthy instances. It can react to instance failures by launching replacements to meet the desired capacity. Elastic Load Balancing distributes traffic but does not manage instance health or replacements. AWS Lambda is a serverless compute service, not for managing EC2 instances. AWS Auto Scaling is a related but broader service; the specific service for EC2 instances is Amazon EC2 Auto Scaling.
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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