IT ELECTRONIC COMMERCE THEORY NOTES

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Presentation transcript:

IT 2031 - ELECTRONIC COMMERCE THEORY NOTES

UNIT II INFRASTRUCTURE FOR E COMMERCE Packet switched networks TCP/IP protocol script Internet utility programmes SGML, HTML and XML web client and servers Web client/server architecture intranet and extranets.

Packet switched networks Packet Switched - network, files and e-mail messages are broken down into small pieces, called packets that are labeled electronically with their origins, sequences, and destination addresses. Routing Packets – LAN, WAN

Routing Packets

TCP/IP TCP controls the disassembly of a message or a file into packets before it is transmitted over the Internet, and it controls the reassembly of those packets into their original formats when they reach their destinations. The IP specifies the addressing details for each packet, labeling each with the packet’s origination and destination addresses. IP addressing – IP v4 –used over 20 yrs. Range : 23^2 = 4,294,967,296 Example : 216.115.108.245 =11011000011100110110110011110101 =3,631,433,189.

Internet utility programmes Finger and Ping Utilities : Finger is a program that runs on UNIX operating systems and allows a user to obtain some information about other network users. A Finger command yields a list of users who are logged on to a network, or reports the last time a user logged on to the network. Disabling the command on their systems for privacy and security reasons

TCP/IP A program called Ping(Packet Internet Groper)- tests the connectivity between two computers connected to the Internet. Provides performance data about the connection between Internet computers, such as the number of computers(hops) between them.

Internet utility programmes Tracert and Other Route-Tracing Programs : Tracert (TRACE RouTe) sends data packets to every computer on the path (Internet) between one computer and another computer and clocks the packets’ round-trip times Others - VisualRoute route-tracing program

Internet utility programmes

Internet utility programmes Telnet and FTP Utilities - Telnet lets a client computer give commands to programs running on a remote host. (FTP) is the part of the TCP/IP rules that defines the formats used to transfer files between TCP/IP-connected computers Indexing and Searching Utility Programs Data Analysis Software - Analog, Keylime Software, UrchinWeb Analytics,Web Side Story, and WebTrends Link-Checking Utilities Remote Server Administration

Web client and servers Major job : respond to requests from Web client computers. Main Elements : Hardware, operating system software, and Web server software. Types of sites : Development sites, Intranets, Extranets, Transaction-processing sites, Content-delivery sites.

Web Client/Server Communication

Two Tier Client / Server Architecture

Three Tier Client / Server Architecture

SGML, HTML XML