Understand the concepts of availability for business continuity. Fault tolerance is the redundancy of components in a system to maintain the system in the event of a failure of one of its components. High availability is similar to fault tolerance because it prevents loss in the event of failure, but the redundant components work together to prevent a failure and allow maintenance in a coordinated system. Load balancing enables the load of a service to be distributed across many identical services. NIC teaming allows bandwidth to be aggregated for the host, or it can create a redundant connection in the event of a connection failure. Port aggregation enables bandwidth to be aggregated between two switches. Clustering provides failover, load balancing, and high availability for the services running on the cluster of hosts.
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