AWS Certified Advanced Networking – Specialty (ANS-C00) — Question 365

You need to set up an Amazon Elastic Compute Cloud (EC2) instance for an application that requires the lowest latency and the highest packet-per-second network performance. The application will talk to other servers in a peered VPC.
Which two of the following components should be part of the design? (Choose two.)

Answer options

• A. Select an instance with support for single root I/O virtualization.
• B. Select an instance that has support for multiple ENAs.
• C. Ensure that the instance supports jumbo frames and set 9001 MTU.
• D. Select an instance with Amazon Elastic Block Store (EBS)-optimization.
• E. Ensure that proper OS drivers are installed.

Correct answer: A, E

Explanation

To achieve the highest packet-per-second performance and lowest latency, Enhanced Networking must be enabled on the Amazon EC2 instance, which utilizes Single Root I/O Virtualization (SR-IOV) and requires the correct OS drivers (such as ENA or ixgbevf) to be installed. Jumbo frames (MTU 9001) are not supported for traffic that leaves a VPC, including traffic over a VPC peering connection. EBS optimization improves storage performance rather than network-to-network traffic, and multiple ENAs do not inherently reduce latency or increase single-flow packet-per-second performance.