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Which of the following statements about fragmentation in paging and segmentation is FALSE?

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Operating Systems - Paging vs Segmentation - Address Translation
Which of the following statements about fragmentation in paging and segmentation is FALSE?
APaging eliminates external fragmentation but can suffer from internal fragmentation.
BSegmentation always causes internal fragmentation due to fixed segment sizes.
CSegmentation can cause external fragmentation because segments vary in size.
DPaging divides memory into fixed-size blocks, reducing external fragmentation.
Step-by-Step Solution
Solution:

  1. Step 1: Understand fragmentation types

    Internal fragmentation occurs when allocated memory is larger than requested; external fragmentation is free memory scattered in small blocks.

  2. Step 2: Analyze segmentation

    Segments are variable-sized, so segmentation does not always cause internal fragmentation; it can cause external fragmentation.

  3. Step 3: Analyze paging

    Paging uses fixed-size pages, eliminating external fragmentation but may cause internal fragmentation.

  4. Final Answer:

    Option B -> Option B

  5. Quick Check:

    Segmentation variable size -> no fixed internal fragmentation [OK]
Quick Trick: Segmentation variable size -> external fragmentation, not internal [OK]
Common Mistakes:
MISTAKES
  • Assuming segmentation causes internal fragmentation
  • Confusing internal and external fragmentation
  • Believing paging causes external fragmentation
Trap Explanation:
PITFALL
  • Option B looks correct because of 'always' but segmentation segments vary in size.
Interviewer Note:
CONTEXT
  • Tests knowledge of fragmentation differences between paging and segmentation.
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