Protection and Shared Pages List-I (Paging Flag) A. Valid-Invalid Bit B. Read-Only Flag C. Shared Page Rule D. Page Table Base Register List-II (Access Enforcement Duty) Valid means page is in RAM; invalid means page is not in the address space Restricts target memory blocks to reading, protecting code sections from edits Shared pages must be reentrant (read-only, self-contained code) Points directly to the location of the active page table in memory

A-1, B-2, C-3, D-4 Explanation: A. Valid-Invalid Bit 1 Explanation: The valid-invalid bit indicates whether the page is currently in RAM (valid) or not in the process's logical address space/memory (invalid). B. Read-Only Flag 2 Explanation: The read-only flag restricts memory block access to reading only, protecting critical code sections and shared libraries from unauthorized modifications or edits. C. Shared Page Rule 3 Explanation: Shared pages must follow reentrancy rules (i.e., they must be reentrant, containing pure read-only code that never modifies itself during execution) so multiple processes can share them safely. D. Page Table Base Register 4 Explanation: The Page Table Base Register (PTBR) points directly to the physical memory location of the currently active page table. Therefore, the correct matching seq

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CUET PG — operating system os PYQ

CUET PG | operating system os |

Protection and Shared Pages

List-I (Paging Flag)

A. Valid-Invalid Bit

B. Read-Only Flag

C. Shared Page Rule

D. Page Table Base Register

List-II (Access Enforcement Duty)

Valid means page is in RAM; invalid means page is not in the address space

Restricts target memory blocks to reading, protecting code sections from edits

Shared pages must be reentrant (read-only, self-contained code)

Points directly to the location of the active page table in memory

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