Virtual server
The network interface presented to the network on behalf of the Microsoft Exchange Server cluster group. A virtual server is a combination of the network name and the IP address resources. All requests to the Microsoft Exchange Server cluster are directed to the virtual server.
Active node
The cluster server that currently owns cluster group resources and responds to network requests made to those services. In a Microsoft Exchange Server cluster environment, only one of the clustered nodes can be active at a given time.
Inactive node
The cluster server that does not currently own cluster group resources but is available if the active node fails over.
Exchange cluster resource group
A logical grouping of Microsoft Exchange Server cluster resources for the purpose of administration and fail over.
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