Discussion
Assertion (A): Memory overcommitment must be applied with care.
Reason (R): If guests actually demand their full allocation the host must swap, and performance collapses.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the failure mode. Overcommitment is a bet that guests will not all claim their allocations at once. If they do, the hypervisor must swap guest memory to disk, and since the guest is itself managing memory it has no idea its pages have gone to disk - the result is thrashing, and performance falls by orders of magnitude rather than degrading gracefully.
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