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All load-balancing solutions require system resources to examine incoming packets and make load-balancing decisions, and thus impose an overhead on network performance. [ Dispatcher-based solutions examine, modify, and retransmit packets to particular cluster hosts. (They usually modify IP addresses to retarget packets from a virtual IP address to a particular host's IP address.) In contrast, Network Load Balancing simultaneously delivers incoming packets to all cluster hosts and applies a filtering algorithm that discards packets on all but the desired host. Filtering imposes less overhead on packet delivery than re-routing, which results in lower response time and higher overall throughput.

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