When a new network drop was installed, the cable was run across several fluorescent lights. The users of
the new network drop experience intermittent connectivity. Which of the following environmental
controls was MOST likely overlooked during installation?

A.
Humidity sensors

B.
EMI shielding

C.
Channel interference

D.
Cable kinking

Explanation:
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. In this case you are experiencing intermittent connectivity since Electro
Magnetic Interference (EMI) was not taken into account when running the cables over fluorescent
lighting.
Incorrect Answers:A: Humidity sensors are used to control and monitor humidity. Humidity control prevents the buildup of
static electricity in the environment and can result in electronic components being vulnerable to damage
from electrical shock and not intermittent connectivity issues as is the case in this scenario.
C: Channel interference is not applicable here, rather it is a matter of interference from electromagnetic
nature.
D: Cable Kinking is not the issue here because there is connectivity, the issue is with the cables being
exposed to electromagnetic interference.

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