The content hosts are defined to form a load-balanced cluster, and one of the network interfaces of the load Balancermachine is assigned a host name and IP address dedicated to the cluster.
Load Balancer can reside on the same machine as a server for which it is load balancing requests; this collocation applies to the Dispatcher and Site Selector components of load Balancer.
Often, in a clustered situation, session state is kept on one computer in the cluster, and the load balancer always directs requests from a user to the machine that is storing his or her session.