Which of the following is the main consideration when a legacy system that is a critical part of a company's infrastructure cannot be replaced?

Question

Options

• AResource provisioning
• BCost
• CSingle point of failure
• DComplexity

• A
  5% (2)
• B
  13% (5)
• C
  79% (30)
• D
  3% (1)

Explanation

When a legacy system cannot be replaced and is critical to company infrastructure, it becomes a single point of failure (C) - meaning if that system goes down, the entire operation it supports can collapse with no fallback. This is the primary architectural concern because it creates catastrophic risk with no recovery path.

Why the distractors are wrong:

• A (Resource provisioning) - allocating compute/memory is a general operational concern, not specific to the irreplaceability of a legacy system.
• B (Cost) - cost matters in many decisions, but it's a factor leading to the inability to replace the system, not the main concern resulting from it.
• D (Complexity) - legacy systems are often complex, but complexity is a characteristic, not the core risk posed by an irreplaceable critical system.

Memory tip: Think of a single point of failure like a one-lane bridge on a highway - if it's the only route and it fails, everything stops. "Cannot be replaced" = "no alternative route" = single point of failure.

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