A company recently experienced data loss when a server crashed due to a midday power outage.
Which of the following should be used to prevent this from occurring again?

A.
Recovery procedures

B.
EMI shielding

C.
Environmental monitoring

D.
Redundancy

Explanation:
Redundancy refers to systems that either are duplicated or fail over to other systems in the event of a
malfunction (in this case a power outage). Failover refers to the process of reconstructing a system or
switching over to other systems when a failure is detected. In the case of a server, the server switches to
a redundant server when a fault is detected. This strategy allows service to continue uninterrupted until
the primary server can be restored.
Incorrect Answers:
A: A recovery procedure is done after the damage has occurred, it does not prevent the damage.
B: EMI Shielding refers to the process of preventing electronic emissions from your computer systems
from being used to gather intelligence and preventing outside electronic emissions from disrupting your
information-processing abilities.
C: Environmental concerns include considerations about water and flood damage as well as fire
suppression.

Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, pp. 32, 380, 383