Welcome to the Windows Fundamentals MCQs Page

Dive deep into the fascinating world of Windows Fundamentals with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Windows Fundamentals, a crucial aspect of Reverse Engineering. In this section, you will encounter a diverse range of MCQs that cover various aspects of Windows Fundamentals, 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.

Check out the MCQs below to embark on an enriching journey through Windows Fundamentals. 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 Windows Fundamentals. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Windows Fundamentals MCQs | Page 16 of 26

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Deciphering Program Data 🔒

Q151.

Why is it not possible to directly call a kernel function from user mode?

It would create a serious vulnerability.

User-mode code does not have access to kernel-mode functions.

Kernel-mode functions cannot be accessed from user mode.

It would slow down the system.

Discuss

Answer: (a).It would create a serious vulnerability. Explanation:It is not possible to directly call a kernel function from user mode because it would create a serious vulnerability.

Q152.

What is the dispatch routine in the system calling mechanism?

A routine that handles basic parameter validation checks.

A routine that switches from user mode to kernel mode.

A routine that performs the requested operation in the kernel.

A routine that handles errors in the system call.

Discuss

Answer: (c).A routine that performs the requested operation in the kernel. Explanation:The dispatch routine is a routine that performs the requested operation in the kernel in the system calling mechanism.

Q153.

How did the system call mechanism change after Windows 2000?

The system no longer invokes interrupt 2E.

The system no longer uses a dispatch routine.

The system no longer switches to kernel mode.

The system no longer supports system calls.

Discuss

Answer: (a).The system no longer invokes interrupt 2E. Explanation:The specific details of how the system call mechanism is implemented have changed after Windows 2000, and the system no longer invokes interrupt 2E.

Q154.

What is a system call?

A user-mode function that calls a kernel-mode function

A kernel-mode function that calls a user-mode function

A high-performance kernel-mode switch instruction

An internal NTOSKRNL function

Discuss

Answer: (a).A user-mode function that calls a kernel-mode function Explanation:A system call is a user-mode function that calls a kernel-mode function.

Q155.

What is the purpose of the system calling mechanism?

To switch from user mode to kernel mode

To switch from kernel mode to user mode

To switch from one user-mode function to another

To switch from one kernel-mode function to another

Discuss

Answer: (a).To switch from user mode to kernel mode Explanation:The system calling mechanism is used to switch from user mode to kernel mode.

Q156.

What does the EAX register contain during a system call?

The service number

The first parameter of the kernel-mode function

The interrupt descriptor table (IDT)

The model specific register (MSR)

Discuss

Answer: (a).The service number Explanation:The EAX register is loaded with the service number during a system call.

Q157.

What is the IDT?

A processor-owned table that tells the processor which routine to invoke whenever an interrupt or an exception takes place

A special CPU instruction that tells the processor to switch to its privileged mode

An array containing pointers to the various supported kernel services

A model specific register (MSR) that stores the address of a predetermined function

Discuss

Answer: (a).A processor-owned table that tells the processor which routine to invoke whenever an interrupt or an exception takes place Explanation:The IDT is a processor-owned table that tells the processor which routine to invoke whenever an interrupt or an exception takes place.

Q158.

What happens when an application calls an operating system API?

The user-mode API performs basic parameter validation checks and calls into the kernel to actually perform the requested operation.

The kernel-mode API performs basic parameter validation checks and calls into the user-mode to actually perform the requested operation.

The user-mode API directly calls a kernel function.

The kernel-mode API directly calls a user-mode function.

Discuss

Answer: (a).The user-mode API performs basic parameter validation checks and calls into the kernel to actually perform the requested operation. Explanation:When an application calls an operating system API, the user-mode API usually performs basic parameter validation checks and calls into the kernel to actually perform the requested operation.

Q159.

What is the mechanism used by operating systems for switching from user mode to kernel mode?

A special CPU instruction that tells the processor to switch to its privileged mode and call a special dispatch routine.

A special CPU instruction that tells the processor to switch to its unprivileged mode and call a special dispatch routine.

A special CPU instruction that tells the processor to switch to its privileged mode and call a normal routine.

A special CPU instruction that tells the processor to switch to its unprivileged mode and call a normal routine.

Discuss

Answer: (a).A special CPU instruction that tells the processor to switch to its privileged mode and call a special dispatch routine. Explanation:The mechanism used by operating systems for switching from user mode to kernel mode is a special CPU instruction that tells the processor to switch to its privileged mode and call a special dispatch routine.

Q160.

Why is it important for reversers to have a basic understanding of executable formats?

To understand a program's architecture

To learn programming languages

To learn about the history of computing

None of the above

Discuss

Answer: (a).To understand a program's architecture Explanation:Reversers need to understand the executable format to get a better understanding of a program's architecture.

Page 16 of 26

Low Level Software 🔒

Reversing Tools 🔒

Auditing Program Binaries 🔒

Reversing Malware 🔒

Antireversing Techniques 🔒

Breaking Protections 🔒

Reversing .NET 🔒

Deciphering Code Structures 🔒

Deciphering Program Data 🔒

Welcome to the Windows Fundamentals MCQs Page

Windows Fundamentals MCQs | Page 16 of 26

Explore more Topics under Reverse Engineering

Introduction to Reverse Engineering

Beyond the Documentation

Deciphering File Formats

Piracy and Copy Protection

Decompilation

Understanding Compiled Arithmetic

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