Question

You are creating several EC2 instances for a new application. For better performance of the application, both low network latency and high network throughput are required for the EC2 instances. All instances should be launched in a single availability zone. How would you configure this? 

A. Launch all EC2 instances in a placement group using a Cluster placement strategy.

B. Auto-assign a public IP when launching the EC2 instances.

C. Launch EC2 instances in an EC2 placement group and select the Spread placement strategy.

D. When launching the EC2 instances, select an instance type that supports enhanced networking.

Answer 1

A. Launch all EC2 instances in a placement group using a Cluster placement strategy.

The Cluster placement strategy helps to achieve a low-latency and high throughput network. The reference is in https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html#placement-groups-limitations-partition.

Option​ ​A ​is​ CORRECT:​ The Cluster placement strategy can improve network performance among EC2 instances. The strategy can be selected when creating a placement group:

EC2 placement groups

Option​ ​B ​is​ ​incorrect:​ Because the public IP cannot improve network performance.

Option​ ​C ​is​ ​incorrect:​ The Spread placement strategy is recommended when a number of critical instances should be kept separate from each other. This strategy should not be used in this scenario.

Option​ ​D ​is​ ​incorrect:​ The description in the option is inaccurate. The correct method is creating a placement group with a suitable placement strategy.