Which of the following provides the BEST application availability and is easily expanded as demand
grows?

A.
Server virtualization

B.
Load balancing

C.
Active-Passive Cluster

D.
RAID 6

Explanation:
Load balancing is a way of providing high availability by splitting the workload across multiple computers.
Incorrect Answers:
A: 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 virtual
machines. The abstraction is done through the use of a hypervisor, which can be either Type I (bare
metal) or Type II (hosted).
C: Active-Passive cluster will provide application availability, but is not as easily expanded as load
balancing.
D: 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.
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, pp. 234-235