Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A company runs a critical web application on Amazon EC2 instances that are part of an Auto Scaling group. The application receives unpredictable traffic spikes. The SysOps administrator needs to ensure that when a scale-out event occurs, new instances are ready to serve traffic quickly to minimize latency spikes. Currently, the instance launch and configuration process (including software installs and cache warming) takes about 5 minutes. The administrator wants to reduce the time it takes for new instances to start serving traffic. Which combination of Auto Scaling features should be used?
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
Use a launch template that includes a pre-warmed Amazon Machine Image (AMI) with all software pre-installed, and configure the Auto Scaling group to use a larger instance type to reduce initialization time.
A pre-warmed AMI can reduce installation time, but it does not eliminate the need for instance launch and initialization (e.g., booting, cache warming). Increasing instance type may not significantly reduce boot time and increases cost.
B
Best answer
Implement an Auto Scaling warm pool with a minimum number of pre-initialized instances in a 'Stopped' state. Configure the scaling policy to move instances from the warm pool to the Auto Scaling group when needed.
A warm pool maintains instances that have been fully launched and configured but are stopped or in a standby state. When scale-out occurs, instances from the warm pool are started or moved into service quickly, drastically reducing the time to handle traffic.
C
Distractor review
Use scheduled scaling to predictively launch instances before the traffic spikes based on historical patterns.
Scheduled scaling works for predictable patterns but does not help with unpredictable traffic spikes. It may either over-provision or under-provision.
D
Distractor review
Configure lifecycle hooks to add a wait time during instance launch so that the instance is fully configured before it is placed behind the load balancer.
Lifecycle hooks add delays to the launch process, making the time to service longer. They are useful for custom actions but do not reduce initialization time.
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: Implement an Auto Scaling warm pool with a minimum number of pre-initialized instances in a 'Stopped' state. Configure the scaling policy to move instances from the warm pool to the Auto Scaling group when needed. — Auto Scaling groups support a warm pool feature, which allows you to keep a pool of pre-initialized EC2 instances that are already launched and configured but not yet in service. When the group needs to scale out, it can immediately move instances from the warm pool to the Auto Scaling group without the delay of launching and bootstrapping. This reduces the time to serve traffic. The warm pool can be configured with a minimum number of instances and a lifecycle state (e.g., Stopped or Running). Option A: Using a launch template with pre-warmed AMIs can reduce boot time but not eliminate the entire 5-minute initialization. Option B: Warm pool is exactly for this purpose. Option C: Scheduled scaling is for predictable traffic, not for unpredictable spikes. Option D: Lifecycle hooks cannot reduce the time; they add additional steps. The correct answer is to use a warm pool.
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
Loading comments…
Sign in to join the discussion.