ch1_OS
... A job swapped in and out of memory to the disk. On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control statement” from the user’s keyboard. On-line system must be available for users to acce ...
... A job swapped in and out of memory to the disk. On-line communication between the user and the system is provided; when the operating system finishes the execution of one command, it seeks the next “control statement” from the user’s keyboard. On-line system must be available for users to acce ...
Introduction to Operating Systems
... It allows for isolation of traffic on the network. A broken connection does not render all communication impossible. More cable is required. Hub failure can disable large segments of the network. Lesson 9 – Introduction to Network Operating Systems ...
... It allows for isolation of traffic on the network. A broken connection does not render all communication impossible. More cable is required. Hub failure can disable large segments of the network. Lesson 9 – Introduction to Network Operating Systems ...
Lecture 15 - Department of Math and Computer Science
... * silly_copy - utterly worthless syscall that copies the len bytes from * 'src' to 'dst' using the kernel as an intermediary in the copy for no * good reason. But it i makes for a good example! ...
... * silly_copy - utterly worthless syscall that copies the len bytes from * 'src' to 'dst' using the kernel as an intermediary in the copy for no * good reason. But it i makes for a good example! ...
What is an Operating System?
... The program that reads and interprets control statements is called variously: – control-card interpreter – command-line interpreter – shell (in UNIX) ...
... The program that reads and interprets control statements is called variously: – control-card interpreter – command-line interpreter – shell (in UNIX) ...
operating systems - Dhoto-Pens
... The goal is protecting the Operating System and others from malicious or ignorant users. The User/Supervisor Mode and privileged instructions. Concurrent threads might interfere with others. This leads to protection of resources by user/supervisor mode. These resources include: I/O Define I/O instru ...
... The goal is protecting the Operating System and others from malicious or ignorant users. The User/Supervisor Mode and privileged instructions. Concurrent threads might interfere with others. This leads to protection of resources by user/supervisor mode. These resources include: I/O Define I/O instru ...
Computer Networks - Home - KSU Faculty Member websites
... NOS Server Hardware NOS servers are large systems with additional memory to support multiple tasks that are all active, or resident, in memory at the same time. Additional disk space is also required on servers to hold shared files and to function as an extension to the internal memory on the sys ...
... NOS Server Hardware NOS servers are large systems with additional memory to support multiple tasks that are all active, or resident, in memory at the same time. Additional disk space is also required on servers to hold shared files and to function as an extension to the internal memory on the sys ...
Modern Trends Used In Operating Systems For High Speed
... This layer in fact consists of user programs and space. In fig 5 the graph represents the difference b/w uniprogramming and multiprogramming. As you see the uniprogramming process in graph which considers a system of 512MB memory excluding the operating system, a disk, a terminal and a printer three ...
... This layer in fact consists of user programs and space. In fig 5 the graph represents the difference b/w uniprogramming and multiprogramming. As you see the uniprogramming process in graph which considers a system of 512MB memory excluding the operating system, a disk, a terminal and a printer three ...
Introduction - Computer Science
... sharing: how are resources shared across users? naming: how are resources named (by users or programs)? security: how is the integrity of the OS and its resources ensured? protection: how is one user/program protected from another? performance: how do we make it all go fast? reliability: what happen ...
... sharing: how are resources shared across users? naming: how are resources named (by users or programs)? security: how is the integrity of the OS and its resources ensured? protection: how is one user/program protected from another? performance: how do we make it all go fast? reliability: what happen ...
Open Source
... It runs on a wider range of hardware platforms and run on less expensive and powerful systems. Linux exceeds other operating systems in its multiprocessing capabilities and its support of advanced TCP/IP networking facilities ...
... It runs on a wider range of hardware platforms and run on less expensive and powerful systems. Linux exceeds other operating systems in its multiprocessing capabilities and its support of advanced TCP/IP networking facilities ...
Programming Interface
... Doesn’t ensure Security Doesn’t provide End-user applications No Support and training ...
... Doesn’t ensure Security Doesn’t provide End-user applications No Support and training ...
Abstract View of System Components
... Time-Sharing Systems Personal-Computer Systems Parallel Systems Distributed Systems ...
... Time-Sharing Systems Personal-Computer Systems Parallel Systems Distributed Systems ...
Process Control Block entity that defines a process to the OS
... – program in execution – entity that can be assigned to and executed on a processor ...
... – program in execution – entity that can be assigned to and executed on a processor ...
Computer Security: Principles and Practice, 1/e
... o A real system, with a full operating system, services and applications, which are instrumented and deployed where they can be accessed by attackers o Is a more realistic target that may occupy an attacker for an extended period o However, it requires significantly more resources o If compromised c ...
... o A real system, with a full operating system, services and applications, which are instrumented and deployed where they can be accessed by attackers o Is a more realistic target that may occupy an attacker for an extended period o However, it requires significantly more resources o If compromised c ...
Slide 1
... The Seven Layers of the OSI Model Application Layer -The purpose is to manage communication between applications. - The layer where applications receive and request data. Presentation Layer - Adds structure to packets of data being exchanged. - Makes sure message transmitted is understood by the re ...
... The Seven Layers of the OSI Model Application Layer -The purpose is to manage communication between applications. - The layer where applications receive and request data. Presentation Layer - Adds structure to packets of data being exchanged. - Makes sure message transmitted is understood by the re ...
Silberschatz, Galvin and Gagne ©2013 Operating System Concepts
... Consider reading a file from disk for a process: ...
... Consider reading a file from disk for a process: ...
Protecting against spear-phishing
... layers of defence available – application whitelisting and system restore methods. Working in the opposite way to blacklists, whitelists enable IT managers to identify exactly which programs should be permitted to run, thus providing greater reassurance that unknown malware and viruses will not infi ...
... layers of defence available – application whitelisting and system restore methods. Working in the opposite way to blacklists, whitelists enable IT managers to identify exactly which programs should be permitted to run, thus providing greater reassurance that unknown malware and viruses will not infi ...
File
... it having any serious faults or ‘bugs’; • It will be well supported with a lot of books about how to use it available as well as on-line help and discussions on the Internet. ...
... it having any serious faults or ‘bugs’; • It will be well supported with a lot of books about how to use it available as well as on-line help and discussions on the Internet. ...
Secure Email
... – The two basic features of Email security are privacy (only the intended recipient can read the message) and authentication (the recipient can be assured of the identity of the sender). The technical capabilities for these functions has been known for many years, but they have only been applied to ...
... – The two basic features of Email security are privacy (only the intended recipient can read the message) and authentication (the recipient can be assured of the identity of the sender). The technical capabilities for these functions has been known for many years, but they have only been applied to ...
The Inexact Science of Internet Filtering for the K
... and/or the content known to be available from the resource and determines its suitability for end-user consumption based on policies • Firewalls can act as content filters but rarely do content filters act as firewalls. Melding of firewalls and filter functionality into single platforms, e.g. Check ...
... and/or the content known to be available from the resource and determines its suitability for end-user consumption based on policies • Firewalls can act as content filters but rarely do content filters act as firewalls. Melding of firewalls and filter functionality into single platforms, e.g. Check ...
Chapter 5
... • Provides means for software to work with the CPU • Responsible for management, scheduling, and interaction of tasks • Provides user interface © 2009 Prentice-Hall, Inc. ...
... • Provides means for software to work with the CPU • Responsible for management, scheduling, and interaction of tasks • Provides user interface © 2009 Prentice-Hall, Inc. ...
CS5038: The Electronic Society - Homepages | The University of
... Targets for all of C, I, and A are 0. When the shock hits, C (blue) is way below target. This causes spend (red) to go way above target, and system availability to go way below target; that is, the system’s operations have to be curtailed and money spent to fix the problem; with these actions taken, ...
... Targets for all of C, I, and A are 0. When the shock hits, C (blue) is way below target. This causes spend (red) to go way above target, and system availability to go way below target; that is, the system’s operations have to be curtailed and money spent to fix the problem; with these actions taken, ...
Hold and wait
... The dispatcher is the module that gives control of the CPU to the process selected by the short-term scheduler. This function involves the following switching context, switching to user mode and jumping to the proper location in the user program to restart that program. ...
... The dispatcher is the module that gives control of the CPU to the process selected by the short-term scheduler. This function involves the following switching context, switching to user mode and jumping to the proper location in the user program to restart that program. ...
I/O and Storage Management
... A read can be serviced by either of the two disks which contains the requested data (improved performance over RAID 0 if reads dominate) A write request must be done on both disks but can be done in parallel Recovery is simple but cost is high ...
... A read can be serviced by either of the two disks which contains the requested data (improved performance over RAID 0 if reads dominate) A write request must be done on both disks but can be done in parallel Recovery is simple but cost is high ...