B.ScIt notes
Unit 4 Unit 5
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Unit 3 BSc IT1
Refer to the file in the given link..... OS Also you can refer the given pdf.. pdf ROM BIOS
Internet - Unit1
The Internet is a global network connecting millions of computers . More than 190 countries are linked into exchanges of data , news and opinions. Internet
http and ftp
Application Layer The application layer is concerned with providing network services to applications. There are many application network processes and protocols that work at this layer, including HyperText Transfer Protocol (HTTP), Simple Mail Transport Protocol (SMTP) and File Transfer Protocol (FTP). At this layer sockets and port numbers are used to differentiate the path and sessions which applications operate. Most application layer protocols, especially on the server side, have specially allocated port numbers, e.g. HTTP = 80 and SMTP = 25, and FTP = 20 (Control), 21 (Data). Download the file......
Central Processing Unit A central processing unit (CPU) is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logical, control and input/output (I/O) operations specified by the instructions. The main function of the CPU is processing instructions given to the computer. This is why the CPU is known as the "brain" of the PC. Every operation that is carried out, including key strokes, opening and closing programs, and saving files, is carried out by the CPU.
TCP/IP Protocol
TCP/IP Overview of TCP/IP reference model TCP/IP that is Transmission Control Protocol and Internet Protocol was developed by Department of Defence's Project Research Agency (ARPA, later DARPA) as a part of a research project of network interconnection to connect remote machines. The features that stood out during the research, which led to making the TCP/IP reference model were: Support for a flexible architecture. Adding more machines to a network was easy. The network was robust, and connections remained intact untill the source and destination machines were functioning. The overall idea was to allow one application on one computer to talk to(send data packets) another application running on different computer.