AWS Certified SysOps Administrator – Associate (legacy) — Question 196

A gaming application is deployed on four Amazon EC2 instances in a default VPC. The SysOps Administrator has noticed consistently high latency in responses as data is transferred among the four instances. There is no way for the Administrator to alter the application code.
The MOST effective way to reduce latency is to relaunch the EC2 instances in:

Answer options

• A. a dedicated VPC.
• B. a single subnet inside the VPC.
• C. a placement group.
• D. a single Availability Zone.

Correct answer: C

Explanation

Relaunching the EC2 instances in a placement group allows them to be physically located close to one another, which significantly reduces latency due to optimized network performance. The other options, such as a dedicated VPC or a single subnet, do not inherently improve the physical proximity of the instances, and while a single Availability Zone can help, it does not guarantee the same level of latency reduction as a placement group.