D. Configuring the High Availability Option for Windows Clustering : DBMS Server Requirements : Virtual Servers
 
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Virtual Servers
To access a DBMS server in a non-cluster environment, network clients must connect to a physical server, identified by a network name and IP address. If that server fails, access to the DBMS is impossible.
Windows Clustering enables the creation of virtual servers, identified by a unique network name and IP address (different from the underlying physical server’s network name and IP address). Unlike a physical server, a virtual server is not associated with a specific computer. If the node hosting the virtual server fails, clients can still access the DBMS using the same server name.