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Use the given figure below 1 2 3 1 2 3 2 Page Table k 10 11 12 13 m 14 15 Logical Мemory What is the physical address of letter "o" in decimal value?

Use the given figure below 1 2 3 1 2 3 2 Page Table k 10 11 12 13 m 14 15 Logical Мemory What is the physical address of letter "o" in decimal value?

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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### Question 17 #### Use the given figure below The figure consists of two parts: "Logical Memory" (a vertical list of letters) and a "Page Table" (a small grid). **Logical Memory:** | Address | Value | |---------|-------| | 0 | a | | 1 | b | | 2 | c | | 3 | d | | 4 | e | | 5 | f | | 6 | g | | 7 | h | | 8 | i | | 9 | j | | 10 | k | | 11 | l | | 12 | m | | 13 | n | | 14 | o | | 15 | p | The figure maps logical addresses 0-15 to corresponding letters a-p. **Page Table:** | INDEX | PAGE VALUE | |-------|------------| | 0 | 5 | | 1 | 6 | | 2 | 1 | | 3 | 2 | The page table maps logical page numbers to corresponding physical page values. #### Question: What is the physical address of the letter "o" in decimal value? Options: - 8 - 9 - 10 - 11 ### Solution: 1. **Determine Logical Address:** The letter "o" is at logical address 14. 2. **Determine Page Number and Offset:** - Logical address 14 falls into page 3 (since 14 is in the range 12-15). - Offset within the page: 14 - 12 = 2. 3. **Find Physical Page Index:** From the page table, page 3 corresponds to physical page 2. 4. **Calculate Physical Address:** Combine the physical page number with the offset: - Physical page number 2 covers addresses (2 * 4) to (2 * 4 + 3) = 8 to 11. - Add the offset 2 to the base address of physical page 2: - Base address: 8 - Offset: 2 - Physical address: 8 + 2 = 10. Thus, the physical address of the letter "o"
Transcribed Image Text:### Question 17 #### Use the given figure below The figure consists of two parts: "Logical Memory" (a vertical list of letters) and a "Page Table" (a small grid). **Logical Memory:** | Address | Value | |---------|-------| | 0 | a | | 1 | b | | 2 | c | | 3 | d | | 4 | e | | 5 | f | | 6 | g | | 7 | h | | 8 | i | | 9 | j | | 10 | k | | 11 | l | | 12 | m | | 13 | n | | 14 | o | | 15 | p | The figure maps logical addresses 0-15 to corresponding letters a-p. **Page Table:** | INDEX | PAGE VALUE | |-------|------------| | 0 | 5 | | 1 | 6 | | 2 | 1 | | 3 | 2 | The page table maps logical page numbers to corresponding physical page values. #### Question: What is the physical address of the letter "o" in decimal value? Options: - 8 - 9 - 10 - 11 ### Solution: 1. **Determine Logical Address:** The letter "o" is at logical address 14. 2. **Determine Page Number and Offset:** - Logical address 14 falls into page 3 (since 14 is in the range 12-15). - Offset within the page: 14 - 12 = 2. 3. **Find Physical Page Index:** From the page table, page 3 corresponds to physical page 2. 4. **Calculate Physical Address:** Combine the physical page number with the offset: - Physical page number 2 covers addresses (2 * 4) to (2 * 4 + 3) = 8 to 11. - Add the offset 2 to the base address of physical page 2: - Base address: 8 - Offset: 2 - Physical address: 8 + 2 = 10. Thus, the physical address of the letter "o"
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