A high-level overview of Layer 4 load balancer for beginners.

Load balancers distribute connections among healthy servers based on the algorithm of your choice (Layer 4 or Layer 7).

The end result is that incoming application and network traffic is distributed across a group of backend servers, making sure no one single server is overloaded and that traffic is only sent to healthy servers. Hence user requests are successfully delivered, without any danger of dropped or interrupted connections.

If a server in the application cluster goes down for any reason, or is taken offline for maintenance, the load balancer immediately redirects traffic to the remaining healthy servers. Without a load balancer, these services experience downtime.

In this video:

0:00 The purpose of a Layer 4 load balancer
0:12 How a Layer 4 load balancer identifies healthy servers
0:21 What happens to a user request without a load balancer
0:45 What happens to a user request with a load balancer

For further details refer to this comprehensive blog: "What is a load balancer?"

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