![]() ![]() NLB is useful for ensuring that stateless applications, such as web servers running Internet Information Services (IIS), are available with minimal downtime, and that they are scalable (by adding additional servers as the load increases). When it is ready, the offline computer can transparently rejoin the cluster and regain its share of the workload, which allows the other computers in the cluster to handle less traffic. For load-balanced applications, when a host fails or goes offline, the load is automatically redistributed among the computers that are still operating. ![]() NLB allows all of the computers in the cluster to be addressed by the same set of IP addresses, and it maintains a set of unique, dedicated IP addresses for each host. ![]() NLB can also direct all traffic to a designated single host, which is called the default host. You can also add hosts dynamically to the cluster to handle increased load. You can configure the load that is to be handled by each host. NLB distributes incoming client requests across the hosts in the cluster. The servers in an NLB cluster are called hosts, and each host runs a separate copy of the server applications. By combining two or more computers that are running applications into a single virtual cluster, NLB provides reliability and performance for web servers and other mission-critical servers. The Network Load Balancing (NLB) feature distributes traffic across several servers by using the TCP/IP networking protocol. For more information about SLB, see Software Load Balancing (SLB) for SDN. You can continue to use NLB with Windows Server 2016 for non-SDN deployments. Use SLB instead of NLB if you are using SDN, are using non-Windows workloads, need outbound network address translation (NAT), or need Layer 3 (元) or non-TCP based load balancing. Windows Server 2016 includes a new Azure-inspired Software Load Balancer (SLB) as a component of the Software Defined Networking (SDN) infrastructure. ![]()
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