Which of the following statements are true? A) Translation Look-aside Buffer (TL

Question

Which of the following statements are true?

A) Translation Look-aside Buffer (TLB) is a memory area that is part of a Memory Management Unit (MMU) used to translate virtual memory addresses into physical memory addresses.

B) A page table is the data structure used by a virtual memory system in a computer operating system to store the mapping between virtual addresses and physical addresses.

C) Virtual memory is a memory management technique that maps memory addresses used by a program, called virtual addresses, into physical addresses in computer memory. An operating system manages virtual address spaces and the association of real memory to virtual memory. An operating system may provide a virtual address ranges that can exceed the capacity of real memory and allow processes to reference more main memory than is physically present in the computer.

D) Virtual memory may be used with a paging technique by which a computer stores and retrieves data from secondary storage for use in main memory. The acts of copying data in a physical page of memory to secondary storage and copying other data from secondary storage into a physical page of memory is called swapping. Frequent swapping is called thrashing, and it drastically reduces aggregate system performance.

E) Swapping may be used by Virtual memory systems to change the mapping from virtual memory to physical memory as a process executes and simulate the availability of more main memory than is physically present in the computer.

1. A, B, C

2. A, C, E

3. A, B, C, D, E

4. B, D

5. B, C, D, E

Explanation / Answer

3. A, B, C, D, E

A. True.
A TLB is an associative cache. Whenever a virtual address needs to be converted to physical address TLB is searched first. If at all match found the physical address is returned.

B. True.
A page table is the data structure used to store mappings of virtual address to physical address.

c. True

d. True

e. True

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