Which components are commonly duplicated in a dual-redundant mission computer architecture?

Which components are commonly duplicated in a dual-redundant mission computer architecture?

• A. The input/output ports only
• B. The cooling system only
• C. Redundant CPUs, memory, interconnects, power rails
• D. The alarm bell only

Answer: (C)

In a dual-redundant mission computer, the focus is on duplicating the parts that directly keep the system operating and accurate: the processing units, memory, data pathways, and power. Two identical CPUs run in parallel and continually compare their results; if one processor deviates, the system can rely on the other and switch outputs to maintain correct operation. Memory is duplicated with error-detection or correction so data integrity is preserved even if a bit flip or error occurs. Interconnects between components are duplicated so a single failed link doesn’t interrupt the flow of data. Power rails are duplicated to endure any single power fault without taking the whole computer offline. This combination is what provides high availability and fault tolerance in critical missions. Duplicating only the cooling system or only the I/O ports wouldn’t protect the core compute and data integrity, and an alarm bell by itself doesn’t contribute to keeping the system running.

In a dual-redundant mission computer, the focus is on duplicating the parts that directly keep the system operating and accurate: the processing units, memory, data pathways, and power. Two identical CPUs run in parallel and continually compare their results; if one processor deviates, the system can rely on the other and switch outputs to maintain correct operation. Memory is duplicated with error-detection or correction so data integrity is preserved even if a bit flip or error occurs. Interconnects between components are duplicated so a single failed link doesn’t interrupt the flow of data. Power rails are duplicated to endure any single power fault without taking the whole computer offline. This combination is what provides high availability and fault tolerance in critical missions. Duplicating only the cooling system or only the I/O ports wouldn’t protect the core compute and data integrity, and an alarm bell by itself doesn’t contribute to keeping the system running.