Joe, the system administrator, is performing an overnight system refresh of hundreds of user computers.
The refresh has a strict timeframe and must have zero downtime during business hours. Which of the
following should Joe take into consideration?

A.
A disk-based image of every computer as they are being replaced.

B.
A plan that skips every other replaced computer to limit the area of affected users.

C.
An offsite contingency server farm that can act as a warm site should any issues appear.

D.
A back-out strategy planned out anticipating any unforeseen problems that may arise.

Explanation:
A backout is a reversion from a change that had negative consequences. It could be, for example, that
everything was working fine until you installed a service pack on a production machine, and then services
that were normally available were no longer accessible. The backout, in this instance, would revert the
system to the state that it was in before the service pack was applied.
Backout plans can include uninstalling service packs, hotfixes, and patches, but they can also include
reversing a migration and using previous firmware. A key component to creating such a plan is identifying
what events will trigger your implementing the backout.
Incorrect Answers:
A: A disk image is usually downloaded and installed when a failure occurs. This is not guaranteeing a zero
downtime.
B: A plan that skips every other replaces computer is not 100% zero down time guaranteed because it will
impact on the business hours.C: An offsite contingence server farm will not offer zero downtime.

Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, p. 443