AWS Certified Advanced Networking Specialty Practice Exam

What is the benefit of using placement groups in AWS?

1. They provide increased redundancy across multiple regions

2. They guarantee lower network latency between instances

3. They enhance disk I/O performance

4. They allow for easier management of resources

The correct answer is: They guarantee lower network latency between instances

Using placement groups in AWS offers the significant benefit of guaranteeing lower network latency between instances. Placement groups are a logical grouping of instances within a single Availability Zone that AWS uses to optimize network performance. By placing instances in the same placement group, AWS ensures that they are located on the same physical hardware or in close proximity to one another, which minimizes latency and maximizes throughput. This is particularly beneficial for applications that require high bandwidth and low latency, such as high-performance computing (HPC) workloads, real-time data analytics, or clustered databases. The design of placement groups allows instances to communicate with one another more efficiently, facilitating rapid data transfer and improving overall application performance. Other options, while related to AWS capabilities, do not directly address the primary purpose of placement groups. For example, while resource management is important, placement groups are not primarily about ease of management; they focus more on performance characteristics.