Are you planning to take the Security+ exam. If so, make sure you have a basic understanding of implementing environmental controls. These controls directly contribute to the availability of systems but also weigh the value of personal safety.
See if you can you answer this sample question?
Q. An attacker was able to sneak into your building but was unable to open the server room door. He bashed the proximity badge reader with a portable fire extinguisher and the door opened. What is the MOST likely reason that the door opened?
A. The access system was designed to fail-open.
B. The access system was designed to fail-close.
C. The access system was improperly installed.
D. The portable fire extinguisher included a proximity badge.
Check out the answer and explanation here.