Number System
Unit 2 Number System
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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......