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Operating System- All Exams & Interview: Practice Test
Operating System (OS) Practice Test useful for GATE, GRE, 98-349 Exam, B.Tech, MBA, MCA, BANK, Graduate Level, MBA, Entrance Exams, Private Exams, Jobs Interview, & other Competitive and Academic Exams. An operating system (OS) is system software that manages computer hardware, software resources, and provides common services for computer programs. Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, printing, and other resources. The operating system acts as an intermediary between programs and computer hardware. Operating System Architecture: The core software components of an operating system are collectively known as the kernel. The kernel has unrestricted access to all of the resources on the system. In early monolithic systems, each component of the operating system was contained within the kernel, could communicate directly with any other component, and had unrestricted system access. While this made the operating system very efficient, it also meant that errors were more difficult to isolate, and there was a high risk of damage due to erroneous or malicious code. Process Management: A Program does nothing unless its instructions are executed by a CPU. A program in execution is called a process. In order to accomplish its task, the process needs the computer resources. There may exist more than one process in the system which may require the same resource at the same time. Therefore, the operating system has to manage all the processes and the resources in a convenient and efficient way. CPU Scheduling Algorithms: CPU Scheduling is a process of determining which process will own CPU for execution while another process is on hold. The main task of CPU scheduling is to make sure that whenever the CPU remains idle, the OS at least select one of the processes available in the ready queue for execution. The selection process will be carried out by the CPU scheduler. It selects one of the processes in memory that are ready for execution. Process Synchronization: Process Synchronization means sharing system resources by processes in such a way that, Concurrent access to shared data is handled thereby minimizing the chance of inconsistent data. Maintaining data consistency demands mechanisms to ensure synchronized execution of cooperating processes. Deadlocks: Deadlock is a situation where a set of processes are blocked because each process is holding a resource and waiting for another resource acquired by some other process. Memory Management: Memory management is the process of controlling and coordinating computer memory, assigning portions called blocks to various running programs to optimize overall system performance. Memory management resides in hardware, in the OS (operating system), and in programs and applications. Virtual Memory: Virtual Memory is a storage allocation scheme in which secondary memory can be addressed as though it were part of the main memory. File System Interface and Implementation: The file system consists of two distinct parts: a collection of files, each storing related data, and a directory structure, which organizes and provides information about all the files in the system. File system implementation defines how files and directories are stored, how disk space is managed, and how to make everything work efficiently and reliablyInput-Output Architecture: The Input-Output Processor is a specialized processor that loads and stores data into memory along with the execution of I/O instructions. Operating System in Distributed Processing: Distributed Operating System is a model where distributed applications are running on multiple computers linked by communications. A distributed operating system is an extension of the network operating system that supports higher levels of communication and integration of the machines on the network. Security and Protection: Security and protection are the two main features that motivated development of a network operating system. Different security concerns such as computer worms, computer virus and authentication. Multiprocessor Systems: Multiprocessor systems provide an alternative for improving performance of computer systems by coupling a number of low cost standard processors. Windows Operating System: Windows 2000, Windows XP and Windows Server 2003 are all part of the Windows NT family of Microsoft operating systems. Operating System (OS): This test covered all topics are:-Operating System ArchitectureProcess Management CPU Scheduling AlgorithmsProcess SynchronizationDeadlocksMemory Management & Virtual MemoryFile System Interface and ImplementationDistributed Processing & Input-Output ArchitectureDistributed Processing & Input-Output ArchitectureSecurity and ProtectionMultiprocessor SystemsWindows Operating SystemWhat Makes This Course Special This Test useful for GATE, GRE, 98-349 Exam, B.Tech, MBA, MCA, BANK, Graduate Level, MBA, Entrance Exams, Private Exams, Jobs Interview, & other Com
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