Contents of a load balancer -
It basically consists of a virtual server which, in turn, consists of an IP address and port. This virtual server is bound to a number of physical services running on the physical servers in a server farm. These physical services contain the physical server’s IP address and port. A client sends a request to the virtual server, which in turn selects a physical server in the server farm and directs this request to the selected physical server.
Persistence can be configured on a Virtual Server; once a server is selected, subsequent requests from the client are directed to the same server. Persistence is necessary in applications where state is maintained on the server, such as a shopping cart application.
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