Exam SK0-005 topic 1 question 197 discussion

Fault tolerance is a broader concept that encompasses various strategies to ensure system reliability and availability, including component redundancy. In the case of dual power supplies connected to different power sources, the primary goal is to create a fault-tolerant system that can continue operating even if one power source fails. Component redundancy is indeed a part of this setup, as there are two power supply units. However, the key aspect here is not just the redundancy of components, but the ability of the system to maintain operation in the face of a power source failure. This ability to continue functioning despite a fault is the essence of fault tolerance

This question sucks so hard. Going with (C). Per the CompTIA Server+ Student Guide: Component redundancy is within the server or network. For example, a single server may have multiple NICs or multiple power supplies. * With that said, the above was all under the Fault Tolerance section of the lesson, but since it's so clearly described I'm going with "Component Redundancy". Again, what absolute disingenuous phrasing and options from CompTIA.

The most correct answer is A. Fault Tolerance would encompass both the different power supplies AND the different power sources. C. would only include the different power supplies.

Different Power Sources is the key here. Dual Power Supplies connected to the same power source is redundancy for if one power supply fails. Dual Power Supplies connected to DIFFERENT power sources, as detailed in the question, is redundancy for if the power source itself fails. This would ensure that if one power source (like main power from the Grid) fails/goes out, the secondary supply connected to a different power source (like a building generator) would allow continued operation.

"FT ensures minimal and core business operations stay online, whereas redundancy is concerned with duplication of hardware and software" https://www.liquidweb.com/kb/high-availability-vs-fault-tolerance/