the world wide web networking and the internet. what is internet? interconnected networks internet...
TRANSCRIPT
THE WORLD WIDE WEB
NETWORKING and the INTERNET
What is Internet?
INTERconnected NETworks
Internet is a collection of local, regional, national and international computer networks that are linked together to exchange data and distribute processing tasks.
Why do people want to get connected to Internet?3
It provides freedom of communicationsInternet is termed by some people as the world of largest
democracy with no government. The Internet is a rare example of a large democracy with no
state of head, no official censors, no bosses, no board of directors. Nobody controls the Internet and in principle, any computer can speak to any other computer, as long as it obeys the technical rules of the TCP/IP protocol.
This freedom of Internet helped it to move out of its original base in military and research institutions, into elementary and high schools, colleges, public libraries, and commercial sectors.
Communication in the Internet
Protocol is a network term used to indicate the standard used by a network for communication.
In a network, all machines must speak the same language to understand each other. We call this language as Protocol.
For realizing a communication, both side must accept and apply the requested protocol.
Internet Protocol (IP)
If you want to connect to another computer, transfer files to or from another computer, or send an e-mail message, you first need to know where the other computer is - you need the computer's "address."
An IP (Internet Protocol) address is an identifier for a particular machine on a particular network; it is part of a scheme to identify computers on the Internet.
IP addresses are also referred to as IP numbers and Internet addresses.
Uniformity of Protocol
TCP (Transmission Control Protocol) / IP (Internet Protocol)
TCP/IP is a family of protocols which contains more than one hundred information communication protocols.
Why is TCP/IP so important
The Internet would never have expanded so rapidly without a commitment to Global Standardization.
Its hard to get experts to agree on a single protocol.TCP/IP is very robust and allows for numerous levels
of sub-networks.
What is an IP address
A way to identify computers or machines on a network
A unique identifier
Used to connect to another computer
All machines connected to the Internet agree to use the same scheme for establishing an address.
Computers can not have the same IP addresses.
World Wide Web (WWW)
It is also commonly known as ‘The Web’.Remember: There are companies that use the Internet
to connect two computers, yet these computers are not part of the WWW.
Parts of a Web Address
A web address is typically composed of four parts: For example, the address http://www.google.com.ph is made
up of the following areas:http://
This Web server uses Hypertext Transfer Protocol (HTTP). This is the most common protocol on the Internet.
wwwThis site is on the World Wide Web.
googleThe Web server and site owner/maintainer.
comThis site means it is a commercial type
phThis tells us it is a site in Philippines.
Web Server Suffixes
com (commercial) edu (educational institution) gov (government) net (network) org (organization)
You might also see addresses that add a country code as the last part of the address such as:
ph (Philippines) uk (United Kingdom) fr (France) us (United States of America) au (Australia)
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Using Browsers
Can type URLsHTML tags tell browser how to display web
page data Back, forward and refresh buttonsSetting a home pagePrint and copy optionsHistory listFavorites and bookmarksEdit and Find
HyperText Transfer Protocol
Internet Protocol Standard HTTPS (Secure) creates a secure channel over an insecure network. is a communications protocol for secure communication over a
computer network, The main motivation for HTTPS is to provide authentication of the
visited website and prevent wiretapping and man-in-the-middle attacks. HTTPS URLs begin with "https://" and use port 443 by default, whereas
HTTP URLs begin with "http://" and use port 80 by default. HTTP is insecure and is subject to man-in-the-middle and eavesdropping
attacks, which can let attackers gain access to website accounts and sensitive information, and modify webpages to inject malware or advertisements. HTTPS is designed to withstand such attacks and is considered secure against such attacks.
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Internet Terminology
Backbone: defines main Internet routes Constructed and maintained by major
telecommunications companies
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Internet Terminology
Packets: small chunks of data ready to travel the Internet
Router: helps send along the packets to correct destination
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Internet Service Provider (ISP)
Provides internet access to businesses, organizations and individuals
Provides telecommunications equipmentUser ID and password requiredConnects you to backboneE-mail account monthly feeShould have local access telephone
numbers
Internet Service Provider - Networks
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Digital Subscriber Line (DSL)
originally digital subscriber loop) is a family of technologies that are used to provide internet access by transmitting digital data over telephone lines. In telecommunications marketing, the term DSL is widely understood to mean asymmetric digital subscriber line (ADSL), the most commonly installed DSL technology.
Questions
What is the difference of HTTP and TCP/IP?