Network Load Balancing (NLB) is an optional component in the Windows Server® 2008 operating system that load balances network traffic (sent to a cluster virtual IP address) among multiple servers in an NLB cluster. This guide provides information on deploying NLB.
Overview of the Network Load Balancing Deployment Process
Implementing a New Network Load Balancing Cluster
Verifying the Network Load Balancing Cluster and Enabling Client Access
Upgrading an existing Network Load Balancing Cluster