Load Balancing in AWS: Part II

Let’s dive into AWS’s Network, Classic, and Gateway Load Balancers.

Network Load Balancers

A Network Load Balancer (NLB) works on the fourth layer of the Open Systems Interconnection (OSI) Model for transmission control protocol (TCP) and user datagram protocol (UDP) connections. Just like ALB, NLB has three components:

• A listener checks for connection requests from clients and forwards requests to target groups.

• A load balancer acts as a single point of contact for customers.

• Target groups forward requests to one or more registered targets using the protocol and port number we specify. We can also configure health checks per target group.

Features

An NLB offers the following features:

• Can handle millions of requests per second and offers very low latency.

• Supports cross-zone load balancing (turned off by default).

• Uses three types of targets for target groups:

  • Instance: When using instance target groups, the client IP address is preserved.
  • IP address: Client IP isn’t preserved. The application will see the private IP

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