Here,s why the other options are not as good:
A). Application Delivery Director (ADC): While ADCs offer Layer 4 capabilities, they also support advanced Layer 7 functionalities like content switching and application-specific routing. These extra features come at a higher cost, which might be unnecessary if you only need Layer 4 load balancing.C. Flexible Load Balancer with Application Load Balancer mode: This mode specializes in Layer 7 (application-layer) load balancing, focusing on factors like URL paths, cookies, and headers. While it supports Layer 4 balancing as well, it,s overkill for your current need and might incur unnecessary costs.D. Gateway Load Balancer: This offering is currently in preview and not generally available. It,s designed for internet gateway-level load balancing, not within a public subnet for your web application.Flexible Load Balancer with Network Load Balancer mode: This configuration provides the perfect balance:
It leverages the Flexible Load Balancer,s core capabilities and cost-effectiveness.
It offers dedicated Network Load Balancer mode, specifically designed for high-throughput, low-latency, Layer 4 load balancing based on source IP address and port.
This is ideal for efficiently distributing traffic across your web servers without needing unnecessary Layer 7 features.