A Group of Amazon EC2 Instances Have Been Configured as a High

question 855

Multiple Choice

A group of Amazon EC2 instances have been configured as a high performance computing (HPC) cluster. The instances are running in a placement group, and are able to communicate with each other at network speeds of up to 20 Gbps. The cluster needs to communicate with a control EC2 instance outside of the placement group. The control instance has the same instance type and AMI as the other instances, and is configured with a public IP address. How can the Solutions Architect improve the network speeds between the control instance and the instances in the placement group?

• A) Terminate the control instance and relaunch it in the placement group.
• B) Ensure that the instances are communicating using their private IP addresses.
• C) Ensure that the control instance is using an Elastic Network Adapter.
• D) Move the control instance inside the placement group.

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