-When you define an Azure Load Balancer, a frontend and a backend pool configuration are connected with a load balancing rule. The health probe referenced by the load balancing rule is used to determine the health of a VM on a certain port and protocol. Based on the health probe results, new flows are sent to VMs in the backend pool. The frontend is defined using a three-tuple comprised of a frontend IP address (public or internal), a protocol, and a port number from the load balancing rule. The backend pool is a collection of Virtual Machine IP configurations. Multiple load balancing rules can deliver flows to the same backend pool instance on different ports by varying the destination port on the load balancing rule.
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