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22-sol - 22 Windows XP Practice Exercises 22.1 CHAPTER What...

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22 C H A P T E R Windows XP Practice Exercises 22.1 What type of operating system is Windows XP ? Describe two of its major features. Answer: A 32/64 bit preemptive multitasking operating system sup- porting multiple users. (1) The ability automatically to repair applica- tion and operating system problems. (2) Better networking and device experience (including digital photography and video). 22.2 List the design goals of Windows XP . Describe two in detail. Answer: Design goals include security, reliability, Windows and POSIX application compatibility, high performance, extensibility, portability and international support. (1) Reliability was perceived as a stringent requirement and included extensive driver verification, facilities for catching programming errors in user-level code, and a rigorous certi- fication process for third-party drivers, applications, and devices. (2) Achieving high performance required examination of past problem ar- eas such as I/O performance, server CPU bottlenecks, and the scalability of multithreaded and multiprocessor environments. 22.3 Describe the booting process for a Windows XP system. Answer: (1) As the hardware powers on, the BIOS begins executing from ROM and loads and executes the bootstrap loader from the disk. (2) The NTLDR program is loaded from the root directory of the identified system device and determines which boot device contains the operating system. (3) NTLDR loads the HAL library, kernel, and system hive. The system hive indicates the required boot drivers and loads them. (4) Kernel execution begins by initializing the system and creating two processes: the system process containing all internal worker threads, and the first user-mode initialization process: SMSS . (5) SMSS further 79
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80 Chapter 22 Windows XP initializes the system by establishing paging files and loading device drivers. (6) SMSS creates two processes: WINLOGON , which brings up the rest of the system, and CSRSS (the Win32 subsystem process).
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