Question 1mediummultiple choice
Full question →mediummultiple choiceObjective-mapped
A company runs a stateless web application on Amazon EC2 instances in an Auto Scaling group across two Availability Zones. The SysOps administrator needs to ensure that the application can tolerate a failure of an entire Availability Zone. Which configuration is required?
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 an Application Load Balancer (ALB) that spans both Availability Zones with health checks enabled.
The ALB distributes incoming traffic across instances in multiple AZs. With health checks, it detects failures and routes traffic only to healthy instances. Combined with Auto Scaling across AZs, this provides zone-failure tolerance.
B
Distractor review
Enable termination protection on all Amazon EC2 instances.
Termination protection prevents an instance from being accidentally terminated. It does not help if the entire Availability Zone fails, because the instance becomes unreachable anyway.
C
Distractor review
Place the Amazon EC2 instances in a cluster placement group.
A cluster placement group places instances in a single Availability Zone to maximize network performance. This reduces fault tolerance, as a single AZ failure would affect all instances.
D
Distractor review
Associate an Elastic IP address with the primary instance.
An Elastic IP is a static public IP address. It does not provide automatic failover; you would need to manually remap it. It is not a solution for multi-AZ high availability.
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 an Application Load Balancer (ALB) that spans both Availability Zones with health checks enabled. — To survive an Availability Zone failure, the application must have instances in multiple AZs and a load balancer that can route traffic away from a failed AZ. An Application Load Balancer (ALB) with targets in both AZs and health checks will automatically stop sending traffic to instances in a failed AZ. Auto Scaling across AZs ensures new instances are launched in healthy AZs. Termination protection is for accidental deletion, not zone failures. Placement Groups are for low latency, not HA. Elastic IPs do not provide failover across AZs.
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.
Discussion
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