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Q:

What are the key object oriented concepts used by Windows NT?

Answer

Encapsulation, Object class and instance.

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Subject: Operating Systems

Q:

A number is selected from the numbers 1,2,3,4.......25.The probability for it to be divisible by 4 or 7 is:

A) 3/25 B) 9/25
C) 1/25 D) None of these
 
Answer & Explanation Answer: B) 9/25

Explanation:

Total numbers = 25

 Numbers divisible by 4 or 7 are 4, 7, 8, 12, 14, 16, 20, 21, 24 = 9

 

 The probability (divisible by 4 or 7) = 9/25

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Filed Under: Probability

Q:

What is page cannibalizing?

Answer

Page swapping or page replacements are called page cannibalizing.

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Subject: Operating Systems

Q:

In loading programs into memory, what is the difference between load-time dynamic linking and run-time dynamic linking?

Answer

For load-time dynamic linking: Load module to be loaded is read into memory. Any reference to a target external module causes that module to be loaded and the references are updated to a relative address from the start base address of the application module.


With run-time dynamic loading: Some of the linking is postponed until actual reference during execution. Then the correct module is loaded and linked.

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Subject: Operating Systems

Q:

What is the difference between routable and non- routable protocols?

Answer

Routable protocols can work with a router and can be used to build large networks. Non-Routable protocols are designed to work on small, local networks and cannot be used with a router

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Subject: Networking
Job Role: Database Administration

Q:

Describe the Buddy system of memory allocation.

Answer

Free memory is maintained in linked lists, each of equal sized blocks. Any such block is of size 2^k. When some memory is required by a process, the block size of next higher order is chosen, and broken into two. Note that the two such pieces differ in address only in their kth bit. Such pieces are called buddies. When any used block is freed, the OS checks to see if its buddy is also free. If so, it is rejoined, and put into the original free-block linked-list.

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Subject: Operating Systems

Q:

OSI Reference Model provides a framework for discussing network operations and design

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

It provides a framework for discussing network operations and design

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Subject: Networking
Job Role: Database Administration

Q:

What are local and global page replacements?

Answer

Local replacement means that an incoming page is brought in only to the relevant process address space. Global replacement policy allows any page frame from any process to be replaced. The latter is applicable to variable partitions model only.

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Subject: Operating Systems