ITPEC IP April 2024 Question 46
In order to achieve a non-stop system, which of the following is an appropriate item to be considered during the design of the system architecture?
Explanation
Dual redundancy of hardware — a non-stop system keeps running when a part fails, which needs a second part already in place to take over.
A non-stop (fault-tolerant) system is designed so that the failure of one component does not stop the service. Servers, disks (RAID), power supplies and network lines are duplicated, and when one fails the other takes over automatically, as in a dual or duplex system. This is decided in the system architecture, because it fixes how many devices there are and how they are connected.
Answer (d)
Why not others:
- •(a) — partitioning software into components makes it easier to develop, reuse and maintain; a single failed server still stops everything
- •(b) — encrypting data protects its confidentiality, not the continuity of processing
- •(c) — lower power consumption cuts running cost and heat; it gives no replacement when a piece of hardware fails
Key rule: Availability comes from removing single points of failure: every component whose failure would stop the system needs a redundant partner that takes over.
System Component · AI-written, may contain errors
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