CompTIA Security+ Question I-12

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

Answer: B

Explanation:
Load balancing is a way of providing high availability by splitting the workload across multiple computers.

CompTIA Security+ Question B-22

Which of the following provides data the best fault tolerance at the LOWEST cost?

A. Load balancing
B. Clustering
C. Server virtualization
D. RAID 6

Answer: D

Explanation:
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. RAID can achieve fault tolerance using software which can be done using the existing hardware and software thus representing the lowest cost option.