Which of the following is immune to the effects of electromagnetic interference (EMI) and therefore has a much
longer effective usable length?

A.
Fiber Optic cable

B.
Coaxial cable

C.
Twisted Pair cable

D.
Axial cable

Explanation:
Because fiber-optic cable passes electrically non-conducting photons through a glass medium, it is immune to
electromagnetic interference.
Incorrect Answers:
B: As an electromagnetic field carries the signal in the Coaxial cable, the signal can be affected by external
inference.
C: As an electromagnetic field carries the signal in the Twisted Pair cable, the signal can be affected by
external inference.
D: An axial cable is a coaxial cable with only one conductor instead of two conductors. Compared to a coaxial
cable the axial cable is more vulnerable to electromagnetic interference.

Stewart, James M., Ed Tittel, and Mike Chapple, CISSP: Certified Information Systems Security Professional
Study Guide, 5th Edition, Sybex, Indianapolis, 2011, p. 100