Can we ensure the same degree of security in a time shared machine as in a dedicated machine?

Category: technology and computing operating systems
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We cannot ensure the same degree of security in a time-share machine as we have in a dedicated machine because time-share machine allows programs to run at the same time and allows many users to use it simultaneously. In this case, the degree of security is less compared to the security in a dedicated machine.

Similarly, you may ask, what are two security problems in a multiprogramming and time sharing environment?

This situation can result in various security problems.

The usual:

  • accessing (reading/modifying/creating) other users files.
  • control of other users processes.
  • fraudulent use of the computer (using others accounts)
  • denying others access to their data, processes, or the computer.

Additionally, what are three advantages and one disadvantage of multiprocessor systems? advantages: Multiprocessor systems can save money, by sharing power supplies, housings, and peripherals. Can execute programs more quickly and can have increased reliability. disadvantages: Multiprocessor systems are more complex in both hardware and software.

Beside above, what is multiprogramming and time sharing?

Main difference between multiprogramming and time sharing is that multiprogramming is the effective utilization of CPU time, by allowing several programs to use the CPU at the same time but time sharing is the sharing of a computing facility by several users that want to use the same facility at the same time.

Is time sharing possible without interrupts?

Without interrupts, it would be impossible to implement multiprogramming or timesharing. A busy-wait would be required so one job couldn't run during another job's I/O wait. Without a timer interrupt, time slices can't be created to divide the CPU among jobs. Interrupts themselves must be synchronized.

39 Related Question Answers Found

What is real system?

Real time system means that the system is subjected to real time, i.e., response should be guaranteed within a specified timing constraint or system should meet the specified deadline. For example: flight control system, real time monitors etc.

What is the purpose of interrupts?

Role of Interrupts. Interrupts are signals sent to the CPU by external devices, normally I/O devices. They tell the CPU to stop its current activities and execute the appropriate part of the operating system. Hardware Interupts are generated by hardware devices to signal that they need some attention from the OS.

What is the purpose of system calls?

System Calls are a way for user programs (running in user mode) to request some service from Operating System. In other words, system calls allow the user programs to ask OS to do some stuff on behalf of the user program. For example, read and write of file which requires the I/O from/to the storage device.

What is symmetric and asymmetric multiprocessing?

The main difference between symmetric and asymmetric multiprocessing is that, in symmetric multiprocessing, the CPUs are identical and they share the main memory while, in asymmetric multiprocessing, the CPUs are not identical and they follow slave-master relationship.

What are the three main purposes of an operating system?

An operating system has three main functions: (1) manage the computer's resources, such as the central processing unit, memory, disk drives, and printers, (2) establish a user interface, and (3) execute and provide services for applications software.

What is the potential problem of multiprogramming?

Stealing or copying of other files
This dilemma will lead to stealing or copying of files which greatly affects many users and because of that it create a negative impact in all other users(who have their original files taken by others) to engage in a multiprogramming and time-sharing environment.

What are the five major activities of an operating system with regard to process management?

This process management operation requires a range of activities, all administered by the operating system.
  • Creating and Deleting.
  • Suspending and Resuming.
  • Synchronizing.
  • Communicating.
  • Deadlock Handling.

What is computer time sharing?

Time-sharing is a technique which enables many people, located at various terminals, to use a particular computer system at the same time. Time-sharing or multitasking is a logical extension of multiprogramming. Processor's time which is shared among multiple users simultaneously is termed as time-sharing.

How many OS are there?

Five Common Operating Systems. The operating system serves as the intermediary between the user and the software on all computing devices.

What is the difference between time sharing and multitasking?

Time sharing is the sharing of a computing resource among many users by means of multiprogramming and multitasking at the same time whereas multitasking is the concurrent execution of multiple tasks or processes over a certain period of time. Thus, this is the main difference between time sharing and multitasking.

How many types of OS are there?

Computer Operating systems can be broadly classified into two types: Normal Operating System. Real Time Operating System.

What is the difference between kernel and user mode?

Most critical tasks of the operating system are executing in the kernel mode. The key difference between User Mode and Kernel Mode is that user mode is the mode in which the applications are running and kernel mode is the privileged mode to which the computer enters when accessing hardware resources.

What do you mean by multitasking?

Multitasking, in an operating system, is allowing a user to perform more than one computer task (such as the operation of an application program) at a time. The operating system is able to keep track of where you are in these tasks and go from one to the other without losing information.

What is time sharing operating system with example?

Time Sharing Operating System. A time sharing system allows many users to share the computer resources simultaneously. In other words, time sharing refers to the allocation of computer resources in time slots to several programs simultaneously. For example a mainframe computer that has many users logged on to it.

How do I install operating system?

Method 2 Installing Your New Operating System
  1. Common Setup keys include F2, F10, F12, and Del/Delete.
  2. Once you are in the Setup menu, navigate to the Boot section. Set your DVD/CD drive as the first boot device.
  3. Once you've selected the correct drive, save your changes and exit Setup. Your computer will reboot.

What are the 4 major types of operating system?

Operating Systems
Platform Operating System
Microcomputers Linux, Macintosh OS, MS-DOS, Windows 98, Windows 2000
Minicomputers Linux, OpenVMS Alpha, UNIX
Mainframe computers IBM OS/390, IBM OS/400, UNIX
Supercomputers IRIX, UNICOS

What is serial processing in operating system?

Types of Operating System. 1) Serial Processing: The Serial Processing Operating Systems are those which Performs all the instructions into a Sequence Manner or the Instructions those are given by the user will be executed by using the FIFO Manner means First in First Out.