Explanation/Reference:
Explanation:
When using source NAT, the client IP address is not passed to the load balanced server. The insertion of the Client IP address into the header allows the exchange servers to see the IP that made the connection.
Level 4 Load Balancer:
A load balancer is a server computer with a very specialized operating system tuned to manage network traffic using user-created rules. Enterprises and hosting companies rely on load-balancing devices to distribute traffic to create highly available services L4 load balancing is fairly simple, two servers sharing the same IP address. You get redirected to the less- busy server.
The most popular Layer 4 load balancing techniques are:
round-robin

weighted round-robin

least connections

weighted least connections