Paul is a new network administrator. He has found that the current network needs an intelligent unit to balance traffic and provide fault-tolerance. Which of the following technologies should Paul implement?

A.
Grid computing

B.
Server farming

C.
Federated servers

D.
Clustering

Explanation:
Clustering is a fault-tolerant server technology that is similar to
redundant servers, except each server takes part in processing services that are
requested. Clusters work as an intelligent unit to balance traffic, and users who
access the cluster do not know they may be accessing different systems at different
times. To the users, all servers within the cluster are seen as one unit.