AWS Certified Advanced Networking – Specialty (ANS-C01)Network Management and OperationsMedium
A financial services company operates a critical application on AWS that requires extremely low latency and high throughput between EC2 instances in different subnets within the same VPC. The application team is reporting inconsistent network performance and occasional spikes in latency, even during periods of low CPU utilization. They suspect network contention or resource exhaustion at the underlying infrastructure level. Which EC2 networking feature, when enabled, provides dedicated network bandwidth and improved packet-per-second (PPS) performance, making it suitable for such latency-sensitive workloads?
- AJumbo Frames (MTU 9001).
- BVPC Endpoints (Interface or Gateway).
- CPlacement Groups (Cluster or Spread).
- DEnhanced Networking with Elastic Network Adapter (ENA).
Show answer & explanationAnswer & explanation
Correct answer: D. Enhanced Networking with Elastic Network Adapter (ENA).
Enhanced Networking, powered by Elastic Network Adapter (ENA), provides significantly higher packet per second (PPS) performance, lower network jitter, and lower latency. It utilizes a custom network interface card (NIC) and driver to bypass the virtualized network stack, offering bare-metal-like network performance directly to the EC2 instance.
Why the other options are wrong
- A. Jumbo Frames (MTU 9001) reduce overhead for large packets but don't inherently improve PPS or reduce latency for general network traffic as directly as ENA.
- B. VPC Endpoints provide private connectivity to AWS services without traversing the internet but do not enhance inter-instance networking performance within a VPC.
- C. Placement Groups influence instance placement for high availability or low inter-instance latency within the same rack, but they don't directly provide dedicated network bandwidth or enhanced PPS performance at the instance level.
Enhanced Networking (ENA)
A feature for EC2 instances that provides significantly higher packet per second (PPS) performance, lower network jitter, and lower latency through a custom Elastic Network Adapter (ENA).
- Uses ENA to bypass virtualized network stack.
- Offers bare-metal-like network performance.
- Crucial for high-performance computing and latency-sensitive apps.
Memory trick: To make your EC2 fly, ENA is the way to high network performance.