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Welcome to the Deciphering Program Data MCQs Page

Dive deep into the fascinating world of Deciphering Program Data with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Deciphering Program Data, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Deciphering Program Data, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Reverse Engineering.

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Check out the MCQs below to embark on an enriching journey through Deciphering Program Data. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Reverse Engineering.

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Deciphering Program Data MCQs | Page 6 of 11

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Q51.
What is the declspec(thread) attribute used for in Windows programs?

a.

Defining a global variable as thread-local

b.

Allocating memory using the TLS API

c.

Checking the attributes of a section in an image executable

d.

Extending the capabilities of the compiler

Discuss
Answer: (a).Defining a global variable as thread-local Explanation:The declspec(thread) attribute in Windows programs is used to define a global variable as thread-local.
Q52.
How can a thread-local variable be identified while reversing a Windows program?

a.

By checking whether it points to a different image section than the rest of the global variables

b.

By checking the attributes of the section containing the variable using a PE-dumping tool

c.

By using the TLS API to retrieve its value

d.

Both a and b

Discuss
Answer: (d).Both a and b Explanation:A thread-local variable can be identified while reversing a Windows program by checking whether it points to a different image section than the rest of the global variables, and by checking the attributes of the section containing the variable using a PE-dumping tool.
Q53.
What is a data structure?

a.

A construct that is specifically laid out in memory to meet certain program needs

b.

A collection of fields of the same data type

c.

A dynamic arrangement that is defined at runtime

d.

A collection of constants that are defined in the code

Discuss
Answer: (a).A construct that is specifically laid out in memory to meet certain program needs Explanation:A data structure is any kind of data construct that is specifically laid out in memory to meet certain program needs.
Q54.
What is a generic data structure?

a.

A chunk of memory that represents a collection of fields of different data types

b.

A collection of fields of the same data type

c.

A dynamic arrangement that is defined at runtime

d.

A collection of constants that are defined in the code

Discuss
Answer: (a).A chunk of memory that represents a collection of fields of different data types Explanation:A generic data structure is any chunk of memory that represents a collection of fields of different data types, where each field resides at a constant distance from the beginning of the block.
Q55.
What is the important thing to remember about generic data structures?

a.

They have a static arrangement that is defined at compile time

b.

They have a dynamic arrangement that is defined at runtime

c.

They have a fixed size that cannot be changed

d.

They only contain fields of the same data type

Discuss
Answer: (a).They have a static arrangement that is defined at compile time Explanation:The important thing to remember about generic data structures is that they have a static arrangement that is defined at compile time, and they usually have a static size.
Q56.
Can a data structure have a variable-sized array as its last member?

a.

Yes, it is possible

b.

No, it is not possible

c.

May be Yes or No

d.

Can't say

Discuss
Answer: (a).Yes, it is possible Explanation:It is possible to create a data structure where the last member is a variable-sized array and that generates code that dynamically allocates the structure in runtime based on its calculated size.
Q57.
Where do generic data structures usually reside?

a.

They rarely reside on the stack

b.

They always reside on the stack

c.

They always reside in heap memory

d.

They can reside in either stack or heap memory

Discuss
Answer: (a).They rarely reside on the stack Explanation:Generic data structures rarely reside on the stack because normally the stack only contains fixed-size elements.
Q58.
Why are data structures usually aligned to the processor's native word-size boundaries?

a.

To save memory

b.

To improve performance

c.

To make the data structure easier to read

d.

None of the above

Discuss
Answer: (b).To improve performance Explanation:Unaligned memory accesses incur a major performance penalty, so data structures are usually aligned to the processor's native word-size boundaries.
Q59.
What is a good example of a Boolean member in a 32-bit-aligned structure?

a.

A member that uses 32 bits of storage

b.

A member that uses 1 bit of storage

c.

A member that uses 16 bits of storage

d.

A member that uses 64 bits of storage

Discuss
Answer: (b).A member that uses 1 bit of storage Explanation:A Boolean member in a 32-bit-aligned structure uses 1 bit of storage, but most compilers will allocate a full 32-bit word for it.
Q60.
Why do compilers usually align data structure member sizes to the processor's word size?

a.

To save memory

b.

To improve performance

c.

To make the data structure easier to read

d.

None of the above

Discuss
Answer: (b).To improve performance Explanation:Even though data structure member sizes might be smaller than the processor’s native word size, compilers usually align them to the processor’s word size to improve performance.
Page 6 of 11

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