Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A startup is migrating a web application to AWS. The application runs on Amazon EC2 instances that use a custom Amazon Machine Image (AMI) with the company's proprietary software. The security team needs to understand which security tasks the company must perform. Under the AWS Shared Responsibility Model, which of the following is the customer's responsibility?
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
Patching the hypervisor that hosts the EC2 instances
Patching the hypervisor is an AWS responsibility under the Shared Responsibility Model, as the hypervisor is part of the virtualization infrastructure that AWS manages.
B
Best answer
Configuring security groups to control inbound traffic to the instances
Configuring security groups is the customer's responsibility. Security groups act as virtual firewalls for EC2 instances, and customers define the rules for allowed traffic, making this a task the customer must perform.
C
Distractor review
Physical security of the data center where the instances run
Physical security of AWS data centers is an AWS responsibility. AWS implements multiple layers of physical controls, including guards, fencing, and access cards, which customers do not manage.
D
Distractor review
Maintaining the underlying network infrastructure
Maintaining the underlying network infrastructure (routers, switches, and cabling) is an AWS responsibility. AWS ensures the availability and security of the network hardware that supports AWS services.
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: Configuring security groups to control inbound traffic to the instances — The AWS Shared Responsibility Model divides security responsibilities between AWS (security OF the cloud) and the customer (security IN the cloud). AWS is responsible for the physical infrastructure, hypervisor, and base network components. The customer is responsible for configuring security groups, managing guest operating system patches (including the OS in the AMI), and securing the application. Option B correctly identifies a customer responsibility because security groups are a virtual firewall that the customer controls. Option A is incorrect: AWS patches the hypervisor. Option C is incorrect: AWS provides physical security of data centers. Option D is incorrect: AWS maintains the underlying network infrastructure (routers, switches, cabling).
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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