Network Load Balancer (NLB)

Overview

• It functions at the transport layer (the fourth layer of the OSI model) (TCP/UDP).

• It can handle millions of requests per second.

• NLBs have ultra-low latency.

• After the load balancer receives a connection request, it selects a target from the target group for the default rule.

• It attempts to open a TCP connection to the selected target on the port specified in the listener configuration.

• It creates a network interface for each Availability Zone you enable.

  • Each load balancer node in the Availability Zone uses this network interface to get a static IP address.

  • When you create an Internet-facing load balancer, you can optionally associate one Elastic IP address per subnet.

It has the same components as Application Load Balancers

Benefits

• Ability to handle volatile workloads and scale to millions of requests per second.

• Support for static IP addresses for the load balancer.

• You can also assign one Elastic IP address per subnet enabled for the load balancer.

• Support for registering targets by IP address, including targets outside the VPC for the load balancer.