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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 7 of 11

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Q61.
Why is it not worthwhile to create a 1-bit-long data member in a 32-bit-aligned structure?

a.

It would take up too much memory

b.

It would not be readable

c.

It would require unaligned memory accesses and shifting to access

d.

None of the above

Discuss
Answer: (c).It would require unaligned memory accesses and shifting to access Explanation:Creating a 1-bit-long data member in a 32-bit-aligned structure would require unaligned memory accesses and quite a bit of shifting and ANDing to access, which would incur a significant performance penalty.
Q62.
What is the smallest unit that 32-bit processors can directly address?

a.

1 bit

b.

1 byte

c.

4 bits

d.

4 bytes

Discuss
Answer: (b).1 byte Explanation:The smallest unit that 32-bit processors can directly address is usually 1 byte.
Q63.
Why would assigning a full byte to a Boolean still result in a significant performance penalty?

a.

Members would lose their 32-bit alignment

b.

It would take up too much memory

c.

It would not be readable

d.

None of the above

Discuss
Answer: (a).Members would lose their 32-bit alignment Explanation:Even if you assign a full byte to your Boolean, members would lose their 32-bit alignment, resulting in a significant performance penalty.
Q64.
What kind of data structures can you expect to see mostly when reversing with most compilers?

a.

16-bit-aligned data structures

b.

64-bit-aligned data structures

c.

32-bit-aligned data structures

d.

Data structures with no alignment

Discuss
Answer: (c).32-bit-aligned data structures Explanation:With most compilers, you can expect to see mostly 32-bit-aligned data structures when reversing.
Q65.
What is an array?

a.

A list of data items stored sequentially in memory

b.

A type of data structure

c.

A way to store items in a random order in memory

d.

None of the above

Discuss
Answer: (a).A list of data items stored sequentially in memory Explanation:An array is simply a list of data items stored sequentially in memory.
Q66.
Why are array accesses generally easy to detect when reversing?

a.

Because the compiler adds some kind of variable to the object’s base address

b.

Because the array is stored in a random order in memory

c.

Because the array uses a complex data structure

d.

None of the above

Discuss
Answer: (a).Because the compiler adds some kind of variable to the object’s base address Explanation:Array accesses stand out because the compiler almost always adds some kind of variable (typically a register, often multiplied by some constant value) to the object’s base address.
Q67.
How can an array be confused with a conventional data structure?

a.

When the source code contains hard-coded indexes into the array

b.

When the array is stored in a random order in memory

c.

When the array is accessed through a complex data structure

d.

None of the above

Discuss
Answer: (a).When the source code contains hard-coded indexes into the array Explanation:In cases where the source code contains hard-coded indexes into the array, it is impossible to tell whether you’re looking at an array or a data structure because the offset could either be an array index or an offset into a data structure.
Q68.
What are generic data type arrays?

a.

Arrays of pointers, integers, or any other single-word-sized items

b.

Arrays that can store any type of data, regardless of size

c.

Arrays that are randomly stored in memory

d.

None of the above

Discuss
Answer: (a).Arrays of pointers, integers, or any other single-word-sized items Explanation:Generic data type arrays are usually arrays of pointers, integers, or any other single-word-sized items.
Q69.
How is the index of a generic data type array managed?

a.

It is simply multiplied by the machine’s word size

b.

It is divided by the machine’s word size

c.

It is multiplied by a random value

d.

None of the above

Discuss
Answer: (a).It is simply multiplied by the machine’s word size Explanation:The index of a generic data type array is simply multiplied by the machine’s word size in order to reach the desired item’s memory address.
Q70.
What is a data structure array?

a.

An array that contains basic data types such as integers.

b.

An array that contains data structures.

c.

An array that contains both basic data types and data structures.

d.

None of the above.

Discuss
Answer: (b).An array that contains data structures. Explanation:Data structure arrays are similar to conventional arrays (that contain basic data types such as integers, and so on), except that the item size can be any value, depending on the size of the data structure.
Page 7 of 11

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