A high-frequency trading application runs on EC2 instances and requires the absolute lowest possible network latency and highest packet per second (PPS) performance between nodes in the same VPC. Which networking feature MUST be utilized?

Answer options:

Elastic Network Adapter (ENA) within a Spread Placement Group.

Elastic Fabric Adapter (EFA) within a Cluster Placement Group.

AWS Transit Gateway with Jumbo Frames enabled.

AWS Direct Connect with MACsec encryption.

How to approach this question

Combine the lowest latency network interface (EFA) with the lowest latency physical placement (Cluster Placement Group).

Full Answer

B.Elastic Fabric Adapter (EFA) within a Cluster Placement Group.✓ Correct

Elastic Fabric Adapter (EFA) is a network interface for Amazon EC2 instances that enables customers to run applications requiring high levels of inter-node communications at scale. A Cluster Placement Group ensures instances are physically close together.

Common mistakes

Choosing ENA instead of EFA for HPC/ultra-low latency requirements.

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