electronic commerce - infrastructure for ecommerce
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IT 2031 - ELECTRONIC COMMERCETHEORY NOTES
UNIT - II
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 forprivacy 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
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