AWS Certified SysOps Administrator – Associate (legacy) — Question 647

Your application currently leverages AWS Auto Scaling to grow and shrink as load Increases/ decreases and has been performing well. Your marketing team expects a steady ramp up in traffic to follow an upcoming campaign that will result in a 20x growth in traffic over 4 weeks. Your forecast for the approximate number of Amazon EC2 instances necessary to meet the peak demand is 175.
What should you do to avoid potential service disruptions during the ramp up in traffic?

Answer options

• A. Ensure that you have pre-allocated 175 Elastic IP addresses so that each server will be able to obtain one as it launches
• B. Check the service limits in Trusted Advisor and adjust as necessary so the forecasted count remains within limits.
• C. Change your Auto Scaling configuration to set a desired capacity of 175 prior to the launch of the marketing campaign
• D. Pre-warm your Elastic Load Balancer to match the requests per second anticipated during peak demand prior to the marketing campaign

Correct answer: B

Explanation

To launch 175 Amazon EC2 instances, you must ensure your regional service limits (quotas) accommodate this number, as default limits are typically much lower; AWS Trusted Advisor can help identify these limits so you can request an increase. Pre-warming an Elastic Load Balancer is unnecessary for a gradual 4-week ramp-up, and pre-allocating Elastic IP addresses is not required since instances in an Auto Scaling group typically use dynamic public IPs or reside in private subnets.