Which of the following best defines add-on security?

Which of the following best defines add-on security?
A .  Physical security complementing logical security measures.
B .  Protection mechanisms implemented as an integral part of an information system.
C .  Layer security.
D .  Protection mechanisms implemented after an information system has become operational.

View Answer

Answer: D

Explanation: The Internet Security Glossary (RFC2828) defines add-on security as "The retrofitting of protection mechanisms, implemented by hardware or software, after the [automatic data processing] system has become operational." Source: SHIREY, Robert W., RFC2828: Internet Security Glossary, may 2000.