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Chapter 3
1
...
Origins
Internet has evolved from a collection of mainframe
computers on a FEW campuses------> to an
interconnected network of thousands of networks &
millions of computers worldwide
...
o In circuit switched networks (ie Telephone system) a
complete point to point circuit is put together and then
communication can proceed
...
)
TCP/IP is divided into 4 layers:
o Network Interface Layer: responsible for placing
packets on and receiving them from a network
medium(LAN (Ethernet), or Token Ring network or any
other
...
o Internet Layer: Responsible for addressing, packaging
and routing messages on the internet
...
o Application Layer: provides a wide variety of
applications with the ability to access the services of the
lower layers
...
Key Concepts
behind Internet
Packet Switching
(1961): a method
of:
slicing digital
messages into
discrete units
called
PACKETS,
sending it
along different
communication
paths as they
become
available
&
reassembling
the packets
once they arrive
to their
destination
...
TCP
(Transmission
Control Protocol):
establishes
connections
among sending
and receiving
computers,
AND handles
assembly and
reassembly of
packets
...
Client Server
Technology:
A model of
computing in
which client
computers are
connected in a
network
together with
one or more
servers
...
Definitions:
Cloud Computing: A model of
computing in which individuals obtain
computing power & software
applications over the internet
...
Internet protocols & Utility programs (such as- Has the following characteristics:
HTTP, SMTP & POP, SSL & TLS, FTP, Telnet,
On demand self-service:
Ping, and Tracert) Provide a number of internet
Consumers can obtain
services
...
Ubiquitous network access: Can
be accessed using standard
network and internet devices
(mobile)
...
User
does not know where resources
are located
...
Measured Service: Charges for
cloud resources are based on the
amount of resources actually
used
...
Structure of the Internet:
Main Structure of the Internet
Backbone: Composed primarily high bandwidth fiber optic cable
...
CANS: Campus area networks
ISPs: Which deal with the 'last mile' of service
...
3
...
Expand bandwidth via improving
fiber optics
...
Wireless LAN and 4G increases
mobile access
...
The Internet of Things will be a big
part of the future
...
The WEB
Origins
Key
The Web was developed during 1989-1991 by Dr
...
He created a program that allowed formatted pages stored on
the internet be linked by keywords (hyperlinks)
...
Concepts
Hypertext HTML
HTTP Web software, browsers, and clients
Urls XML
5
...
They make it possible by allowing computer users to access product/service info and to
complete purchases online
...
Web 2
...
6
...
M-commerce apps are part of the larger $128 billion m-commerce market
...
Variety of different platforms for development: Java, Objective-C, C and C++
...
(Google Play, Apple and Amazon)