System reliability is increased by:
A.
A lower MTBF and a lower MTTR.
B.
A higher MTBF and a lower MTTR.
C.
A lower MTBF and a higher MTTR.
D.
A higher MTBF and a higher MTTR.
Explanation:
In general, reliability (systemic def.) is the ability of a person or system to perform and maintain its functions in
routine circumstances, as well as hostile or unexpected circumstances. Mean-time-between failure (MTBF) is
the average length of time the hardware is functional without failure. Mean-time-to-repair is the amount of time
it takes to repair and resume normal operation after a failure has occurred. Having a higher MTBF and a lower
MTTR will increase the reliability of a piece of equipment, thus the system’s overall reliability.
VALLABHANENI, S. Rao, CISSP Examination Textbooks, Volume 2: Practice, SRV Professional
Publications, 2002, Chapter 8, Business Continuity Planning & Disaster Recovery Planning (page 496).
http://en.wikipedia.org/wiki/Reliability.