Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company has deployed a web application on Amazon EC2 instances behind an Application Load Balancer (ALB). The application's IP addresses are used by a third-party service to allowlist traffic. The EC2 instances are part of an Auto Scaling group that may scale up and down. The SysOps administrator needs to ensure that the third-party service always has the current IP addresses of the ALB without requiring manual updates. Which solution should the administrator implement?
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
Best answer
Use AWS Global Accelerator and provide the static IP addresses to the third party
Global Accelerator provides two static IP addresses that serve as a fixed entry point. You can add the ALB as an endpoint, and traffic will be directed to the ALB's current healthy instances, while the static IPs remain unchanged.
B
Distractor review
Use Amazon Route 53 with a simple routing policy pointing to the ALB DNS name
Route 53 simple routing resolves to the ALB's DNS name, which resolves to the ALB's IP addresses, but those IPs can change over time. The third party requires static IPs, not a DNS name.
C
Distractor review
Use an Amazon CloudFront distribution with the ALB as the origin and provide the CloudFront IP addresses
CloudFront uses a shared IP range that is not dedicated to a specific distribution. These IPs also change when CloudFront updates its edge locations, so they are not a stable, dedicated set of IPs for allowlisting.
D
Distractor review
Use an AWS Network Load Balancer (NLB) with static IP addresses in front of the ALB
An NLB cannot directly target an Application Load Balancer. You would need to configure a target group of instances or IPs, which adds complexity and does not leverage the ALB's advanced features. Global Accelerator is the simpler and recommended solution.
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.
Related practice questions
Related SOA-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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 company uses Amazon CloudFront to deliver content to a global audience. The origin is an Application Load Balancer in us-east-1. The SysOps administrator wants to reduce costs by minimizing the number of requests that reach the origin server. Which action should the administrator take?
Question 2
A company runs a batch processing application on Amazon EC2 that runs for 2 hours every night. The workload can tolerate interruptions. Which EC2 purchasing option provides the lowest cost for this use case?
Question 3
A SysOps administrator needs to monitor the CPU utilization of an Amazon RDS DB instance and receive an alarm when CPU utilization exceeds 80% for 5 consecutive minutes. Which AWS service should be used to create this alarm?
Question 4
A company runs a critical web application on Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer (ALB). The application uses session stickiness (sticky sessions) to maintain user sessions. The SysOps administrator notices that when instances are replaced during a scale-in or failure event, users lose their session data. The administrator needs to preserve session data across instance failures without losing stickiness benefits. What should the administrator do?
Question 5
A company runs a production web application on a single Amazon EC2 instance. The application experiences a predictable and steady workload 24/7. The SysOps administrator wants to minimize compute costs for this instance while ensuring it remains available during the expected workload. Which EC2 purchasing option should the administrator use?
Question 6
A company has a VPC with public and private subnets. The private subnets host application servers that need to make outbound HTTPS connections to the internet. The SysOps administrator must implement a solution that provides outbound internet connectivity while preventing inbound connections from the internet. Additionally, the solution must allow the company to control which domains the application servers can access. Which solution should the administrator implement?
FAQ
Questions learners often ask
What does this SOA-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: Use AWS Global Accelerator and provide the static IP addresses to the third party — AWS Global Accelerator provides two static anycast IP addresses that can be assigned to an Application Load Balancer as an endpoint. These static IP addresses remain constant, and traffic is routed to the ALB through the AWS global network. This eliminates the need for a third party to update allowlists based on changing ALB IP addresses.
What should I do if I get this SOA-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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