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Windows Server® 2008 Administrator’s Companion by Charlie Russel and Sharon Crawford

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Network Load Balancing Clusters

NLB provides a highly available and scalable solution for TCP/IP-based network applications such as a Web server or an 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 2008 networking driver. It acts independently of the TCP/IP networking stack and is transparent to that stack. The NLB driver (Nlb.sys) sits between the TCP/IP stack and the network card drivers, with the Windows Load Balancing Service (Nlb.exe)—the necessary NLB control program—running on top, alongside the actual server application. (See Figure 21-2 ...

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