ECURSIVE LOAD-BALANCE
Stay connected at all times automatic failover or keep multiple WAN links all the time, keeps the network running, with continuous monitoring of the status of all connections, promptly redirecting traffic in the event of an active connection being interrupted.
network load balancing is commonly used to provide network redundancy so that in the event of a WAN link outage, access to network resources is still available via the secondary link(s).
A high availability system reliably provides an acceptable level of service with minimal downtime. To provide high availability, NLB includes built-in features that can automatically:
REDUNDANT LOAD BALANCE
Detect a cluster host that fails or goes offline, and then recover.
Balance the network load when hosts are added or removed.
Recover and redistribute the workload within five seconds.
DISTRIBUTE WORKLOAD
A failover cluster provides redundancy and high availability but doesn’t distribute workload. Load balancing improves performance by distributing a workload across multiple servers. Server clustering combines servers to operate as a single entity.
Both network load balancing and server clustering coordinate multiple servers to manage a greater workload, but load balancers can more easily be integrated into existing architecture and used to distribute workload, while server clusters typically demand identical hardware.
Load balancers perform health checks on servers before routing requests to them. If one server is about to fail, or is offline for maintenance or upgrades, load balancing automatically reroutes the workload to a working server to avoid service interruptions and maintain high availability.
