AWS Certified SysOps Administrator – AssociateNetworking and Content DeliveryHard
A SysOps administrator is designing a network architecture for a new application that requires very high throughput and low latency between EC2 instances in different subnets within the same VPC. The application is sensitive to network jitter. What is the MOST suitable networking feature to ensure optimal performance between these instances?
- AVPC Peering
- BJumbo Frames (MTU 9001)
- CPlacement Groups (Cluster or Spread)
- DEnhanced Networking with ENA
Show answer & explanationAnswer & explanation
Correct answer: D. Enhanced Networking with ENA
Enhanced Networking with Elastic Network Adapter (ENA) provides significantly higher packet per second (PPS) performance, lower inter-instance latency, and lower network jitter compared to traditional network interfaces. This is crucial for applications requiring very high throughput and low latency within a VPC and sensitive to jitter. While Jumbo Frames can help with throughput by reducing packet overhead, ENA provides the fundamental performance improvement.
Why the other options are wrong
- A. VPC Peering connects different VPCs, not instances within the same VPC for internal communication.
- B. Jumbo Frames (MTU 9001) allow larger packet sizes, which can reduce CPU utilization and increase throughput for large data transfers, but ENA provides the underlying high PPS, low latency, and low jitter.
- C. Placement Groups (Cluster) can group instances for low latency within an Availability Zone but don't inherently provide the network performance enhancements of ENA itself.
EC2 Enhanced Networking
A feature that provides significantly higher packet per second (PPS) performance, lower network jitter, and lower latency for EC2 instances.
- Uses Elastic Network Adapter (ENA) or Intel 82599 Virtual Function (VF) interface.
- Crucial for high-performance computing (HPC) and network-intensive applications.
- Must be enabled on supported instance types.
Memory trick: ENA is the engine for EC2's network speed and smoothness.