Eli5: layer 4 and layer 7 load balancing

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what exactly is layer 4 and layer 7 load balancing

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If the TCP connection request hits the load balancer but isn’t terminated there, instead it’s routed to one of a number of servers that are bound to the requested IP address, then that’s layer 4 – the load balancing occurs at the transport layer

If the load balancer terminates the connection and then forwards the payload – eg a http request – to one of a number of servers – then that’s layer 7, the application layer