Network Load Balancing Clusters

NLB provides a highly available and scalable solution for TCP/IP-based network applications such as a Web server or FTP server. By combining the resources of two or more servers into a single cluster, NLB can provide for redundancy of information and resources while servicing far more clients than a single server alone could handle.

NLB Concepts

NLB is a Windows Server 2003 networking driver. It acts independently of the TCP/IP networking stack and is transparent to that stack. The NLB driver sits between the TCP/IP stack and the network card drivers, with the Windows Load Balancing Service (Wlbs.exe)—the necessary NLB control program—running on top, alongside the actual server application (see Figure 18-2). ...

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