-
Open system & Closed system?
1, Give two real-world examples of closed systems. How well does each protct its software?
2, Is each of the following an open system or a closed system? For each system, give an example of a real-world attack that has occurred.
a. PC
b. Cell Phone
c. iPod
d. Xbox
e. Kindle (an e-book reader)zia khan
- Apr 25th, 2014
Open systems are computer systems that provide some combination of interoperability, portability, and open software standards. (It can also refer to specific installations that are configured to allow...
-
Active Directory User Accounts
can we create Multiple User Accounts in Active Directory in a single shot? if So what is the command or tool used?
dashokkumar
- Oct 25th, 2013
You can create Bulk User Accounts in Active Directory using cmdlets, however these are not scalable to the entire organization provided all your technicians have expert scripting knowledge. Alternativ...
Sanjay Mishra
- Oct 25th, 2013
You can create multiple user account by using dsadd command.
Create batch file put all user name and require field and execute it. -
Memory Protection
Why do we need memory protection and how the protection is eccomplished by the CPU?
G.Simon
- Jan 4th, 2013
The following Segment Registers are used to protect the Memory of CPU. It is related to Memory layout. such as stack, heap, code and Data of a process. segment registers: CS contains the segment of t...
fordownload85
- Aug 15th, 2009
This is done by using registers we have some thing called fence registers
-
What is DHCP Relay Agent?
Suthakar
- Dec 4th, 2012
We use DHCP Relays when DHCP client and server don't reside on the same (V)LAN, as is the case in this scenario. The job of the DHCP relay is to accept the client broadcast and forward it to the server on another subnet.
Sandhya.Kishan
- Mar 14th, 2012
It is a Bootstrap Protocol that relays DHCP(Dynamic Host Configuration Protocol) messages between clients and servers for DHCP on different IP Network.using DHCP in a single segment network is easy. I...
-
Explain briefly about, processor, assembler, compiler, loader, linker and the functions executed by them?
Processor:--A processor is the part a computer system that executes instructions .It is also called a CPU Assembler: -- An assembler is a program that takes basic computer instructions and converts them into a pattern of bits that the computer's processor can use to perform its basic operations. Some people call these instructions assembler language and others use the term assembly language. Compiler:...
aman singh
- Jun 11th, 2012
Assembler is a programming language which converts assembly language into machine language..and compiler is a language which convert high level language to machine language at once..whereas interpreter does that line by line
ashishgarg
- Aug 19th, 2008
Processor is the one which executes the instructions.Compiler takes the source code and generates the assembly language code.Assembler takes the assembly language code and generates an object file.Lin...
-
Condition for deadlock occurrence?
Deadlock can arise if four conditions hold simultaneously.Mutual exclusion: only one process at a time can use a resource.Hold and wait: a process holding at least one resource is waiting to acquire additional resources held by other processes.No preemption: a resource can be released only voluntarily by the process holding it, after that process has completed its task.Circular wait: ...
Sandhya.Kishan
- Jun 1st, 2012
The condition for the occurrence of deadlocks are Mutual Exclusion: At least one resource must be non-shareable.[1] Only one process can use the resource at any given instant of time. Hold and Wait ...
-
Differentiate between Complier and Interpreter?
An interpreter reads one instruction at a time and carries out the actions implied by that instruction. It does not perform any translation. But a compiler translates the entire instructions.
Sandhya.Kishan
- Apr 23rd, 2012
The compiler converts a high level language instruction into into machine language where as an interpreter converts the high level instruction into some intermediate form and after that, the instructi...
-
While running DOS on a PC, which command would be used to duplicate the entire diskette?
diskcopy Java Thread States
Sandhya.Kishan
- Apr 23rd, 2012
Diskcopy command is used to duplicate the diskette,while running DOS on PC.
-
Why paging is used?
Paging is solution to external fragmentation problem which is to permit the logical address space of a process to be noncontiguous, thus allowing a process to be allocating physical memory wherever the latter is available.
Sandhya.Kishan
- Apr 23rd, 2012
Paging is a process of dividing the memory into equal sized logical blocks.When any page is required the operating system searches for that page in the secondary memory and copies that page to the mai...
-
What is Context Switch?
Switching the CPU to another process requires saving the state of the old process and loading the saved state for the new process. This task is known as a context switch.Context-switch time is pure overhead, because the system does no useful work while switching. Its speed varies from machine to machine, depending on the memory speed, the number of registers which must be copied, the existed of special...
Sandhya.Kishan
- Apr 23rd, 2012
Context switching is a process of storing and restoring the state of the CPU So that the execution of the process can be resumed from the same point where it had been switched. There are 3 situations ...
-
What is heartbeat in clustering?
Sandhya.Kishan
- Mar 14th, 2012
Heartbeat cluster is a program that runs specialized scripts automatically whenever a system is initialized or rebooted.This cluster allows clients to know about the presence (or disappearance!) of pe...
-
-
Kerberos Port No
what is the Port No used by Kerberos Protocol?
-
What is the important aspect of a real-time system or Mission Critical Systems?
A real time operating system has well defined fixed time constraints. Process must be done within the defined constraints or the system will fail. An example is the operating system for a flight control computer or an advanced jet airplane. Often used as a control device in a dedicated application such as controlling scientific experiments, medical imaging systems, industrial control systems, and some...
-
Root hints
What are root hints?
kifill76
- Sep 28th, 2011
Root hints are DNS data store table used in basic terms to locate authoritative dns servers.
-
Check OS errors
which tool is used to check for application and OS errors in a server?
kifill76
- Sep 28th, 2011
Within a windows system event logs capture system, applications, a security events by default. Dependent upon error or events captured there is a plethora of tools which can be used to diagnose and gain in-depth analysis. once such common set of tools are sysinternals suite.
-
What is the difference between synchronization and mutual exclusion?
Jared Southern
- Sep 23rd, 2011
As I understand it, and I'm just revising it, Conditional synchronisation is the mechanism that allows one to achieve mutual exclusion in a program.
Regards
Jaredrakesh trichy
- Oct 11th, 2008
Mutual Exclusion:1. Lock and unlock operations are always performed by the same thread. 2. Thread blocked on semaphore cannot be awakened by a signal. Synchronization: 1. Lock and unlock operations...
-
Describe different job scheduling in operating systems?
Scheduling is the activity of the deciding when process will receive the resources they request.FCFS: --- FCSFS stands for First Come First Served. In FCFS the job that has been waiting the longest is served next.Round Robin Scheduling: ---Round Robin scheduling is a scheduling method where each process gets a small quantity of time to run and then it is preempted and the next process gets to run....
priya adak
- Sep 20th, 2011
job scheduling also called as long term scheduling....It select the process from these pool and load them into memory for execution..It controls the degree of multiprogramming....If the degree of mult...
thukral.rahul
- Jan 12th, 2010
Windows uses priority based pre-emptive CPU / Job scheduling algorithm.
-
What are the basic functions of an operating system?
Operating system controls and coordinates the use of the hardware among the various applications programs for various uses. Operating system acts as resource allocator and manager. Since there are many possibly conflicting requests for resources the operating system must decide which requests are allocated resources to operating the computer system efficiently and fairly. Also operating system is control...
Rahul
- Aug 31st, 2011
-Interface between User Copmuter and Copmuter Harware.
-create the environment to user can execute the process.
-intermediate between application and hardware.
-control the execution of application program.khan.abul786
- May 24th, 2010
Basically operating system is a system sofware and a set of instructions which creates a plateform for the user to interact with the computer hardware. It works as an intermediary between the computer...
-
What is the function of NTLDR file in system?
Kannan Kanna
- Aug 4th, 2011
NTLDR (abbreviation of NT loader) is the boot loader for all releases of Microsoft's Windows NT operating system up to and including Windows XP and Windows Server 2003. NTLDR is typically run from the...
victory1
- Jun 20th, 2011
NTLDR (NTLOADER) which is preboot sequence process of windows 2003 operating system.
Windows Interview Questions
Ans