What is the main use case for Network Load Balancers in AWS?

The main use case for Network Load Balancers in AWS centers around their capability to handle high volumes of traffic efficiently and effectively distribute that traffic to multiple backend instances. They are designed to operate at the transport layer (Layer 4 of the OSI model), which allows them to manage millions of requests per second while maintaining ultra-low latencies. This makes them particularly suitable for high-traffic websites and microservices architectures that require quick response times and high availability.

Network Load Balancers can route TCP and UDP traffic, making them ideal for scenarios where performance is critical and where users are expecting fast, reliable service. They also support static IP addresses and Elastic IPs, further enhancing their ability to facilitate seamless and efficient traffic management in dynamic environments like microservices.

In contrast, the other choices describe use cases that do not align as closely with the Network Load Balancer's strengths. Managing serverless applications typically relies on services like AWS Lambda and API Gateway, while content delivery networks focus on caching and optimizing content delivery rather than load balancing traffic directly. Database query routing is a specific concern more aligned with database management rather than load balancing in a network sense. Therefore, the network load balancer's fit with high-traffic scenarios and microservices clearly marks it as the