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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 11 of 11

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Q101.
What is a virtual function table?

a.

A table that is created at runtime to determine which particular method is called when an overloaded base-class method is invoked.

b.

A table that is created at compile time for classes that define virtual functions and for descendant classes that provide overloaded implementations of virtual functions defined in other classes.

c.

A table that is used to find the correct function when someone calls into one of the virtual methods.

d.

A table that contains hard-coded pointers to all virtual function implementations within a specific class.

Discuss
Answer: (b).A table that is created at compile time for classes that define virtual functions and for descendant classes that provide overloaded implementations of virtual functions defined in other classes. Explanation:Compilers implement the virtual function mechanism by use of a virtual function table, which is created at compile time for classes that define virtual functions and for descendant classes that provide overloaded implementations of virtual functions defined in other classes.
Q102.
What is a VFTABLE pointer?

a.

A pointer that is used to find the correct function when someone calls into one of the virtual methods.

b.

A pointer that is initialized by compiler-generated code to point to the correct virtual function table.

c.

A pointer that is used to determine which specific descendant of a class will be passed to a function.

d.

A pointer that is used to allow a program to utilize an object’s services without knowing which particular object type it is using.

Discuss
Answer: (b).A pointer that is initialized by compiler-generated code to point to the correct virtual function table. Explanation:In runtime, the compiler adds a new VFTABLE pointer to the beginning of the object, usually before the first data member. Upon object instantiation, the VFTABLE pointer is initialized (by compiler-generated code) to point to the correct virtual function table.
Q103.
How are virtual function calls identified while reversing?

a.

By the use of the ECX register and the fact that the CALL is not using a hard-coded address.

b.

By the fact that the function's pointer and the data it works with reside in the same data structure.

c.

By the fact that the function's address is obtained through a function table.

d.

None of the above

Discuss
Answer: (a).By the use of the ECX register and the fact that the CALL is not using a hard-coded address. Explanation:Virtual function calls are identified while reversing by the use of the ECX register and the fact that the CALL is not using a hard-coded address but is instead accessing a data structure in order to get the function's address. This data structure is essentially the same data structure loaded into ECX, which tells us that the function pointer resides inside the object instance and indicates that this is a virtual function call.
Q104.
What is the importance of constructors in inherited objects with virtual functions?

a.

They initialize the object's virtual function table pointers.

b.

They determine the type of object instantiated.

c.

They perform the actual initialization of the virtual function table.

d.

Both a and c

Discuss
Answer: (d).Both a and c Explanation:Constructors in inherited objects with virtual functions are important because they perform the actual initialization of the virtual function table pointers.
Q105.
How does object initialization take place in C++?

a.

The base class constructor calls the inherited class constructor.

b.

The inherited class constructor calls the base class constructor.

c.

The compiler adds calls to the ancestor's constructor before the descendant's constructor code.

d.

The ancestor's constructor is called only after the descendant's constructor code is executed.

Discuss
Answer: (b).The inherited class constructor calls the base class constructor. Explanation:In C++, object initialization takes place when the constructor for its specific type is called, and if the object is inherited, the compiler adds calls to the ancestor's constructor before the beginning of the descendant's actual constructor code.
Q106.
What does the base class constructor do?

a.

Calls the inherited class constructor.

b.

Initializes the virtual function table with its own copy.

c.

Returns after initializing the virtual function table.

d.

Both b and c

Discuss
Answer: (d).Both b and c Explanation:The base class constructor initializes the virtual function table with its own copy and returns after initializing the virtual function table. It doesn't call any other constructors since it is the base class.
Q107.
How do constructors in inherited classes differ from constructors in base classes?

a.

Inherited class constructors initialize the virtual function table to the base class's table.

b.

Base class constructors call other constructors in the inheritance chain.

c.

Inherited class constructors don't call the base class's constructor.

d.

Base class constructors determine the type of object instantiated.

Discuss
Answer: (c).Inherited class constructors don't call the base class's constructor. Explanation:Constructors in inherited classes differ from constructors in base classes because the inherited class constructor actually calls the base class's constructor, whereas the base class constructor doesn't call anyone else.
Q108.
What is the purpose of the ENTER instruction?

a.

To push the current instruction pointer onto the stack

b.

To pop the return address into the EIP register

c.

To set up a stack frame by pushing EBP into the stack and setting it to point to the top of the local variable area

d.

To restore ESP and EBP to their previously stored values

Discuss
Answer: (c).To set up a stack frame by pushing EBP into the stack and setting it to point to the top of the local variable area Explanation:The ENTER instruction sets up a stack frame by pushing EBP into the stack and setting it to point to the top of the local variable area.
Page 11 of 11

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