A technician is investigating intermittent switch degradation. The issue only seems to occur when the
building’s roof air conditioning system runs. Which of the following would reduce the connectivity issues?

A.
Adding a heat deflector

B.
Redundant HVAC systems

C.
Shielding

D.
Add a wireless network

Explanation:
EMI can cause circuit overload, spikes, or even electrical component failure. In the question it is
mentioned that switch degradation occurs when the building’s roof air-conditioning system is alsorunning. All electromechanical systems emanate EMI. Thus you could alleviate the problem using EMI
shielding.
Incorrect Answers:
A: A heat deflector will add to more EMI emanation since it is also an electromechanical system.
B: Redundant HVAC systems will not reduce the connectivity issues.
D: Adding a wireless network means more work for the switch and not really addressing the issue of the
switch that requires EMI shielding.

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