Question1
The type of memory that allows for very effective multiprogramming and relieves the user of memory size constraints is referred to as:
选择一个答案
a. Virtual memory √ |
b. Real memory |
c. Main memory |
d. All of the above |
Question2
The replacement policy that is impossible to implement because it would require the O/S to have perfect knowledge of future events is called the:
选择一个答案
a. Least recently used (LRU) policy |
b. Clock policy |
c. Optimal policy √ |
d. None of the above |
Question3
The replacement policy that chooses only among the resident pages of the process that generated the page fault in selecting a page to replace is referred to as a:
选择一个答案
a. Local replacement policy √ |
b. Variable replacement policy |
c. Global replacement policy |
d. None of the above |
Question4
The concept associated with determining the number of processes that will be resident in main memory is referred to as:
选择一个答案
a. A cleaning policy |
b. Load Control |
c. None of the above |
d. The page fault frequency √ |
Question5
In SVR4 and Solaris systems, the memory management scheme that manages user processes and disk I/O is called the:
选择一个答案
a. Paging system √ |
b. None of the above |
c. Virtual memory manager |
d. Kernel memory allocator |
Question6
The multilevel memory management scheme implemented in Linux was designed to minimize large page tables and directories in which of the following line of processors:
选择一个答案
a. 32-bit Pentium/X86 architecture |
b. 16-bit X86 architecture |
c. 64-bit Alpha architecture √ |
d. None of the above |
Question7
The Windows 2000 virtual memory manager can use page sizes ranging from:
选择一个答案
a. 64 KB to 4 GB |
b. None of the above |
c. 4 KB to 64 KB √ |
d. 4 GB to 4 TB |
Question8
The situation where the processor spends most of its time swapping process pieces rather than executing instructions is called:
选择一个答案
a. Paging |
b. The Principle of Locality |
c. None of the above |
d. Thrashing √ |
Question9
The situation that occurs when the desired page table entry is not found in the Translation Lookaside Buffer (TLB) is called a:
选择一个答案
a. None of the above |
b. TLB hit |
c. TLB miss √ |
d. Page fault |
Question10
The real address of a word in memory is translated from the following portions of a virtual address:
选择一个答案
a. None of the above |
b. Frame number and offset |
c. Page number and frame number |
d. Page number and offset √ |
Question11
Segmentation has a number of advantages to the programmer over a non-segmented address space, including:
选择一个答案
a. Sharing among processes |
b. Simplifying the handling of growing data structures |
c. All of the above √ |
d. Protection |
Question12
In a combined paging/segmentation system, a user’s address space is broken up into a number of:
选择一个答案
a. Fixed-size pages, which are in turn broken down into variable-sized segments |
b. Segments or pages, at the discretion of the programmer |
c. Variable-sized Segments, which are in turn broken down into fixed-size pages √ |
d. All of the above |
Question13
Sharing is achieved in a segmentation system by:
选择一个答案
a. Having a common data area that all processes can share |
b. Referencing a segment in the segment tables of more than one process √ |
c. All of the above |
d. Each process segment table having a reference to the dispatcher main memory area |
Question14
A fundamental choice in the design of the memory-management portion of an O/S is:
选择一个答案
a. Whether or not to use virtual memory techniques |
b. All of the above √ |
c. Whether to use paging, segmentation of a combination of the two |
d. The algorithms employed for various aspects of memory management |
Question15
The fetch policy that exploits the characteristics of most secondary memory devices, such as disks, which have seek time and rotational latency is called:
选择一个答案
a. Swapping |
b. Demand paging |
c. Prepaging √ |
d. None of the above |
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