Operating System (Assignment)

1. In a multiprogramming and beat sharing environment, several substance abusers sh ar the strategy simultaneously. This situation abide results in various security problems. a. What are the dickens such problems? autonomic nervous establishment The two problems in Multiprogramming and time sharing environment are take or copying a users accommodates Writing over an early(a)(prenominal) programs (belonging to another user or to the OS) area in memory Using system resources (central processing unit, disk space) without proper accounting Causing the printer to mix end product by sending data while some other users file is printing. ttp//wiki. answers. com/Q/What_are_the_main_two_problems_in_multiprogramming_environment_when_processes_are_ absorb_concurrently_and_ parcel_the_resources b. Can we ensure the same degree of security in a time shared machine as in a sanctified machine? Explain. Ans No, because time-shared machines are far less secure, and are real easy to overload the buffers. Also they are much slower to enthral a virus. http//wiki. answers. com/Q/Can_we_ensure_the_same_security_in_a_time-shared_machine_as_in_a_dedicated_machine . The issue of resource utilization shows up in differenct forms in different types of operating systems. List what resources must be manged carefully in the interest settings a. Mainframe or Minicomputer systems Ans Memory, mainframe computer, Storage b. Workstations connected to servers Ans Storage, Network Bandwidth c. Handheld computers Ans Memory, CPU, Storage, Power 3. Describe the struggle stellate and asymmetric multi touch. What are three advantages and one disadvantages of multiprocessor system? AnsThe end between symmetric and asymmetric multiprocessing is that in Symmetric processing treats all processors as equals I/O can be touch on on any of them, while Asymmetric processing designates one CPU as the master, which is the only one capable of performing I/O the master distributes computational wo rk among the other CPUs. Advantagesmultiprocessor system ?Can merely money, by sharing power supplies, housings, and peripherals ? Can execute programs more cursorily ?Can have increased reliability Disadvantagesmultiprocessor system More interwoven in both hardware and software. Additional CPU cycles are require to manage the cooperation, so per-CPU efficiency goes down. http//www. studymode. com/essays/Os-Assignment-419243. html 4. Distinguish between the lymph node server and peer to peer models of distributed systems. Ans A client-server model can be defined as a centralized environment, where all users, objects, resources, and so on are administered in a centralized location and can, if configured, use any network resources on any workstation on the domain. while a Peer-to-peer model can be defined as a decentralise environment, where the user must be assigned permissions on each workstation in order to access any available resources. 5. What is the purpose of interrupts? What are the distinction between a trap and an interrupt? Can traps be generated on purpose by a user program? If so, for what purpose? Ans The difference between Interrupt and Trap is that Interrupt is a hardware-generated signal that changes the string up at bottom the system. While a trap is a software-generated interrupt. 6.Define the essential properties of the following types of operating systems. a. Batch Jobs with similar needs are batched together and run by means of the computer as a group, by an operator or automatic job sequencer. Performance is increased by attempting to keep CPU and I/O devices busy at all times through buffering, off-line operation, spooling, and multiprogramming. b. Interactive Composed of many short transactions with remark and output read/written on the screen the results and timing of the neighboring transaction may be unpredictable. Note that a urely interactive system (no time-sharing) only has one user e. g. , a PC). c. Time-sharing Uses CPU scheduling and multiprogramming to provide economical interactive use of a system. The CPU switches cursorily from one user to another. d. Real-time The system must respond to inputs/commands within a fixed amount of time to ensure correct performance. stimulant is typically read from sensors. e. NetworkConsists of two or more computers that are linked in order to share resources (such as printers and CDs), exchange files, or allow electronic communications.The computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared arc beams. f. ParallelMore than one event happening at a time. It is usually contrasted with serial, meaning only one event happening at a time. g. Distributed Divides computation up among several computers. The computers do not share memory or a clock they communicate with each other over communication lines (e. g. , high-speed bus, telephone line). h. Clustered i. HandheldA handheld computer is a computer that c an conveniently be stored in a pocket (of sufficient size) and used while youre attribute it.