Capacidad de
un sistema para continuar prestando un servicio activamente bajo condiciones
adversas. Se consideran tanto desastres naturales, como accidentes y ataques
deliberados.
(I) The ability of a system
to remain in operation or existence despite adverse conditions, including
natural occurrences, accidental actions, and attacks. (Compare: availability,
reliability.) [RFC4949:2007]
The capability of a system
to fulfill its mission, in a timely manner, in the presence of attacks,
failures, or accidents. Timeliness is a
critical factor that is typically included in (or implied by) the very
high-level requirements that defines mission.
However, timeliness is such an important factor that we include it
explicitly in the definition of survivability.
It is important to recognize that is it the mission fulfillment that
must survive, not any particular subsystem to fulfill its mission, even if
significant portions of the system are damaged or destroyed. We will sometimes use the term survivable
system as a less than perfectly precise shorthand for a system with the
capability to fulfill a specified mission in the face of attacks, failures, or
accidents.
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