computer_knowlege4_you

OSI MODEL  What is the OSI model ? The full name of the OSI model is Open Systems Interconnection, developed in 1978 by ISO (Internationa l Standard Organization ) and the model consists of 7 layers. The OSI model is a reference model for communication between two users in a network. Each layer of this model does not depend on the other layer but there is a transmission of data from one layer to another. The OSI model describes how to send and receive data or information in a network. All layers of the OSI model have their own different functions so that data can be easily accessed from one system to another. The OSI model also describes how network hardware and software function as layers with each other. Layers of OSI MODEL OSI model has the following 7 layers                           layers in OSI model PHYSICAL LAYER The physical layer is the lowest layer in the OSI model . This layer is responsible for physical and electrical connections such

DEADLOCK what is deadlock ? Deadlock is a situation in which two computer processes share only one resource, due to which no process can access the resource. That is, a deadlock is a condition in which two or more processes fight  for only one resource, due to which no one is able to access the resource. For example, suppose there are two friends and both want to play computer games, due to which both fight. One has a remote control and the other has a cd of games.  Due to which neither of the two friends are able to play but neither of them is ready to cooperate. This condition is called deadlock . According to the picture we have two processes A and B and two resources r1 and r2. It contains resource r1 that is allocated with process A, and resource r2 that is allocated with process B. But resource r2 is required to complete the process so it requests r2, but r2 is already allocated with B. Similarly process B requires r1 to complete its execution, but

 MICROPROCESSOR                                          The microprocessor is a clock driven ,programmable,register based device.                                                   t he microprocessor reads the data i.e.binary instruction from the memory .it accepts this binary data as input and process the data according to the instructions and computes the result as output.         Any such machine that does some process (implementation, process) is called processor. The CPU is a very complex (complex) set of Electronic Circuit that executes the program Instruction collected. Microprocessor is an important part of PC (Personal Computer) that processes data. CPU stands for Central Processing Unit. The microprocessor is called the CPU that fits on top of a microchip and is made of microchip silicon which is equipped with millions of transistors and other components very well. There is a very complected switching circuit inside it, which executes the instructions very fas