In order to optimize performance for a compute cluster that requires low inter-node latency, which of the
following feature should you use?
A.
Multiple Availability Zones
B.
AWS Direct Connect
C.
EC2 Dedicated Instances
D.
Placement Groups
E.
VPC private subnets
Explanation:
http://aws.amazon.com/ec2/faqs/ (enhanced networking)
D, Placement Groups (or enhanced networking if they give that as an answer on the test)
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html
A placement group is a logical grouping of instances within a single Availability Zone. Placement groups are recommended for applications that benefit from low network latency, high network throughput, or both. To provide the lowest latency, and the highest packet-per-second network performance for your placement group, choose an instance type that supports enhanced networking. For more information, see Enhanced Networking.
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