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Welcome to the Deciphering Code Structures MCQs Page

Dive deep into the fascinating world of Deciphering Code Structures with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Deciphering Code Structures, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Deciphering Code Structures, 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 Code Structures. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Reverse Engineering.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Deciphering Code Structures. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Deciphering Code Structures MCQs | Page 3 of 11

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Q21.
What is the IAT used for?

a.

To store the actual address of the target function

b.

To load the function’s pointer from the Import Directory

c.

To resolve the function’s name with a matching function in the target executable

d.

None of the above

Discuss
Answer: (a).To store the actual address of the target function Explanation:The IAT is used to store the actual address of the target function.
Q22.
How are imported function calls implemented?

a.

Using the Import Directory and IAT

b.

By embedding the function’s address into the code

c.

By storing the function’s name in the code

d.

None of the above

Discuss
Answer: (a).Using the Import Directory and IAT Explanation:Imported function calls are implemented using the Import Directory and IAT.
Q23.
How can imported function calls be detected?

a.

By locating the IAT and confirming that a function is imported

b.

By checking the function’s name in the code

c.

By checking if the function is called indirectly through a hard-coded function pointer

d.

None of the above

Discuss
Answer: (a).By locating the IAT and confirming that a function is imported Explanation:Imported function calls can be detected by locating the IAT and confirming that a function is imported.
Q24.
What is the most basic form of logic in most programs?

a.

Function call

b.

Conditional jump

c.

Single-branch conditional

d.

Assembly language

Discuss
Answer: (c).Single-branch conditional Explanation:The most basic form of logic in most programs consists of a condition and an ensuing conditional branch, which is known as single-branch conditional.
Q25.
What does a high-level if statement consist of?

a.

A condition and a block of conditional code

b.

A function call and a conditional jump

c.

An assembly language instruction and a logical check

d.

A bitwise AND operation and a jump instruction

Discuss
Answer: (a).A condition and a block of conditional code Explanation:A high-level if statement consists of a condition and a block of conditional code that gets executed if the condition is satisfied.
Q26.
Which instruction is used to perform a zero check for EAX in assembly language?

a.

AND

b.

TEST

c.

JMP

d.

CALL

Discuss
Answer: (b).TEST Explanation:The TEST instruction is used to perform a zero check for EAX in assembly language by performing a bitwise AND operation on EAX and setting flags to reflect the result.
Q27.
Why is the condition reversed in single-branch conditionals?

a.

To make the code run faster

b.

To follow the same order as in the source code

c.

To confuse reverse engineers

d.

To make the code more difficult to read

Discuss
Answer: (b).To follow the same order as in the source code Explanation:The condition is reversed in single-branch conditionals because the compiler-generated binary code is organized in memory in the same order as it is organized in the source code. Therefore, if the variable being checked is nonzero, the compiler must skip the conditional code section and go straight to the code section that follows.
Q28.
What is the difference between single-branch conditionals and two-way conditionals?

a.

Single-branch conditionals have only one possible code block while two-way conditionals have two possible code blocks.

b.

Single-branch conditionals always use the if-else keyword pair while two-way conditionals do not.

c.

Single-branch conditionals always reverse the condition while two-way conditionals do not.

d.

Single-branch conditionals are easier to implement in assembly language than two-way conditionals.

Discuss
Answer: (a).Single-branch conditionals have only one possible code block while two-way conditionals have two possible code blocks. Explanation:Single-branch conditionals only have one possible code block that gets executed if the condition is satisfied. Two-way conditionals, on the other hand, have two possible code blocks that get executed depending on whether the condition is satisfied or not.
Q29.
What is the purpose of the TEST instruction in assembly language?

a.

To perform a bitwise AND operation on two registers.

b.

To perform a bitwise OR operation on two registers.

c.

To perform a logical NOT operation on a register.

d.

To perform a logical comparison and set flags based on the result.

Discuss
Answer: (d).To perform a logical comparison and set flags based on the result. Explanation:The TEST instruction performs a logical comparison of two operands and sets flags based on the result. It is often used in conditional statements in assembly language.
Q30.
How is the meaning of the conditional jump reversed in single-branch conditionals?

a.

By changing the order of the operands in the TEST instruction.

b.

By adding a NOT operator to the condition.

c.

By using a different conditional jump instruction.

d.

By reversing the condition in the source code.

Discuss
Answer: (d).By reversing the condition in the source code. Explanation:In single-branch conditionals, the meaning of the conditional jump is reversed by reversing the condition in the source code. For example, if the source code checks whether a variable is equal to zero, the assembly language code will check whether the variable is non-zero (since it will jump to the code that follows if the variable is zero).
Page 3 of 11

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