Jane has implemented an array of four servers to accomplish one specific task. This is BEST known as
which of the following?

A.
Clustering

B.
RAID

C.
Load balancing

D.
Virtualization

Explanation:
Anytime you connect multiple computers to work/act together as a single server, it is known as
clustering. Clustered systems utilize parallel processing (improving performance and availability) and add
redundancy (but also add costs).
Incorrect Answers:
B: RAID, or redundant array of independent disks (RAID). RAID allows your existing servers to have more
than one hard drive so that if the main hard drive fails, the system keeps functioning.
C: Load balancing is a way of providing high availability by splitting the workload across multiple
computers.
D: Virtualization is the foundation for cloud computing. You cannot have cloud computing without
virtualization. It makes it possible by abstracting the hardware and making it available to the virtualmachines. The abstraction is done through the use of a hypervisor, which can be either Type I (bare
metal) or Type II (hosted).

Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, pp. 234-235