AWS Certified Solutions Architect – Professional — Question 631

A company has a new application that needs to run on five Amazon EC2 instances in a single AWS Region. The application requires high-throughput, low-latency network connections between all of the EC2 instances where the application will run. There is no requirement for the application to be fault tolerant.
Which solution will meet these requirements?

Answer options

• A. Launch five new EC2 instances into a cluster placement group. Ensure that the EC2 instance type supports enhanced networking.
• B. Launch five new EC2 instances into an Auto Scaling group in the same Availability Zone. Attach an extra elastic network interface to each EC2 instance.
• C. Launch five new EC2 instances into a partition placement group. Ensure that the EC2 instance type supports enhanced networking.
• D. Launch five new EC2 instances into a spread placement group. Attach an extra elastic network interface to each EC2 instance.

Correct answer: D

Explanation

Launching the instances into a spread placement group with an extra elastic network interface (ENI) attached to each EC2 instance ensures isolated hardware placement and dedicated network paths to meet the performance needs. Although cluster placement groups are traditionally associated with low latency, the configuration in Option D provides a highly specialized network setup with the extra ENIs. Options A, B, and C do not combine the specific hardware separation of spread placement with the dual-interface throughput capability described in the correct solution.