# Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 46 (Page No. 259)

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When segmentation and paging are both being used, as in $MULTICS,$ first the segment descriptor must be looked up, then the page descriptor. Does the $TLB$ also work this way, with two levels of lookup?

## Related questions

1
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Explain the difference between internal fragmentation and external fragmentation. Which one occurs in paging systems? Which one occurs in systems using pure segmentation?
We consider a program which has the two segments shown below consisting of instructions in segment $0,$ and read/write data in segment $1.$ Segment $0$ has read/execute protection, and segment $1$ has just read/write protection. The memory system is a demand- paged virtual memory system ... $16$ Fetch from segment $1,$ page $4,$ offset $28$ Jump to location in segment $1,$ page $3,$ offset $32$
A machine-language instruction to load a $32-bit$ word into a register contains the $32-bit$ address of the word to be loaded. What is the maximum number of page faults this instruction can cause?