IT 2031 Subject Code, Electronic Commerce Notes

1. IT 2031 - ELECTRONIC COMMERCE
THEORY NOTES
UNIT - II

2. 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.

3. 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

4. Routing Packets

5. 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.

6. 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

7. 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.

8. 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

9. Internet utility programmes

10. 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

11. 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.

12. • Web Client/Server Communication

13. Two Tier Client / Server
Architecture

14. Three Tier Client / Server
Architecture