Lesson: Internet Applications

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Week 3:
Using Internet Applications
Subject Code: COMP121
By: Marlon Jamera
Email: mjdesignexpress@gmail.com

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Review: Introduction to
World Wide Web
1. It is the largest network in the world
that connects hundreds of thousands of
individual networks.
a. Intranet
b. Internet
c. Local Area Network
d. None of the above

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Review: Introduction to
World Wide Web
2. The space of electronic movement of
ideas and information.
a. Intranet
b. Internet
c. Cyberspace
d. Intraspace

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Review: Introduction to
World Wide Web
3. Who owns the internet?
a. Department of Defense
b. ARPANET
c. No one
d. Ray Tomlinson

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Review: Introduction to
World Wide Web
4. In what year did Walter Maner decided
to use the word “Computer Ethics”?
a. 1960’s
b. 1970’s
c. 1980’s
d. 1990’s

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Review: Introduction to
World Wide Web
5. It began as a United States Department of
Defense network to link scientists and
university professors around the globe.
a. True
b. False

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Using Internet Applications

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Scope of the Lesson
• Internet, Intranet and Extranet
• Internet Tools and Services
• HTTP (Hypertext Transfer Protocol)
• FTP (File Transfer Protocol)
• E-mail
• IRC (Internet Relay Chat)
• WWW (World Wide Web)
• Gopher
• WAIS

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Learning Outcomes
By the end of the lesson, you will be
familiar with the internet applications and
its uses.
• Justify internet applications.
• Analyze the internet protocols being
used for the internet.

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Learning Outcomes
• Determine the theoretical perspectives
that influence the internet applications.
• Compare the internet tools and services
that are very useful for the applications of
the internet.

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Internet, Intranet and Extranet
• What is Internet?
• It is a “Network of Network” that
includes millions of public and private,
academic, business and government
networks locally and globally.
• It is linked by copper wires, wireless
connection, fiber optics and other
technologies.

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Hardware and Software
of the Internet
• Modem
• Device that enable computers to
communicate through the ISP.
• Computer
• In addition to a modem, you need a
hardware capable for handling multiple
data types.

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Hardware and Software
of the Internet
• Software
• Two types of software’s required to
enable your PC as an internet PC.
• Communication Software to
establish connection.
• Client Software for browsing, e-
mail and news. These software’s are
provided by windows itself.

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Applications of Internet
• Downloaded programs and files
• E-mail
• Voice and Video Conferencing
• E-commerce
• File Sharing
• Information Browsing
• Search the web addresses using search
engines
• Chat and a lot more

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Disadvantage of
the Internet
• Theft of Personal Information: such as
names, address, credit card number, etc.
• Virus Threats: nothing but a program
which disrupts the normal functioning of
the system.
• Spamming: refers to receiving
unwanted e-mails in bulk, which provide
no purpose and needlessly obstruct the
entire system.

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Disadvantage of
the Internet
• Pornography: this is perhaps the
biggest threat related to children’s healthy
mental life. A very serious issue
concerning the internet.
“Though, internet can create destruction
and its misuse can be very fatal, the
advantages of it outweigh its
disadvantages.”

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Intranet
• What is Intranet?
• Internal company network that uses
internet standards (HTML, HTTP and
TCP/IP protocols) and software.
• Accessed only by authorized person,
especially members or employees of
the organization.

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Intranet Security
• Two levels of Security Required:
• Internal
• Can be imposed by public Key
Security and Encryption Key.
• External
• Through Firewall.

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Intranet Security
• What is Firewall?
• Security device located between
firm’s internal network (intranet) and
external network (internet)
• Regulates access into and out of
company’s network based on a set of
rules.
“Needs to be upgraded from time to time to
check potential security problems.”

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Applications of Intranet
• Sharing of company policies & rules
• Access employee database
• Distribution of circular or office orders
• Access products and customer data
• Sharing of information of common
interest
• Launching of department homepages
• Submission of reports
• Corporate telephone directories

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Disadvantages of
the Intranet
• Management Problem
• A company may not have person to
update their intranet on a routine basis
• Limited bandwidth for the business
• Security Problem
• Unauthorized access
• Abuse Access
• Denial of service

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Disadvantages of
the Intranet
• Productivity Problem
• Information overload lowers
productivity
• True purpose of intranet is unknown
to many employees or departments
• Hidden or unknown complexity and
costs

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Extranet
• What is Extranet?
• Extranet is an intranet for outside
authorized users using same internet
technology.
• Inter-organizational information
system.
• Enable outsiders to work together
with company’s employees
• Open to selected suppliers, customers
and other business partners.

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Extranet - Example
• Dealers / Distributors have access to
product files such as:
• Product specifications
• Pictures
• Images
• Information to answer customers
queries.

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Benefits of Extranet
• Improved quality
• Lower travel costs
• Lower administrative and other overhead
costs
• Reduced paper works
• Delivery of accurate information on time
• improved customer service
• better communication
• Overall improvement in business
effectiveness.

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Disadvantages of
the Extranet
•The suppliers and the customers do not
have technical knowledge
• Faceless contact
• Information can be misused by other
competitors
• Fraud may be possible
• Technical employees are required

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Layered System View

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What are the Major
Internet Tools and Services
• HTTP (Hyper Text Transfer Protocol)
• FTP (File Transfer Protocol)
• E-mail
• IRC (Internet Relay Chat)
• WWW (World Wide Web)
• Gopher
• WAIS

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HTTP (Hypertext
Transfer Protocol)
• Allows setting rules that computers use
to move files from one computer to
another on the internet
• It is the most common transfer protocol
used on the internet
• You can see this protocol often before
the URL.
• E.g. http://www.google.com

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FTP (File Transfer Protocol)
• Allows the transfer or copying of files
from one computer to another
• Ideal for procuring or sending files to a
remote computer
• FTP programs are available freely
• Modern browsers have built-in FTP
capabilities

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E-Mail
• The most popular use of the Internet
• Available for free on the web
• Gmail
• Yahoomail
• Hotmail
• Valid email address consists of a
username and a domain name separated
by the “@” sign.
• E.g. juandelacruz@gmail.com

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IRC (Internet Relay Chat)
• Allows real time, text based
communication through the internet
• Organized by topic of interest through
“channels”
• Discussion occurs in “Chat Rooms”
• Some website have built-in chat rooms.

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IRC (Internet Relay Chat)

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WWW (World Wide Web)
• Invented in 1991 by Tim Berners-Lee,
the web is the fastest-growing internet
service
• Based on HTML(Hyper Text Markup
Language) allowing users to access data in
multimedia format
• Simplest unit is the webpage, primarily a
document encoded in HTML format that
can be accessed using a browser

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WWW (World Wide Web)
• HTML links contents within a web page
to each other as well as to other web pages
through a hyperlink
• Each page has an address, a URL
(Uniform Resource Locator)

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Gopher
• Allows user to access files from a
different computers by looking through
hierarchical menus to finds specific topics.
A document may be text, sounds, image or
other type of file.
• A program called Jughead can be used to
search for topics found with gopher files.

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Gopher

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WAIS (Wide Area
Information Services)
• WAIS is a search engine developed for
the internet
• It allows one to search the complete text
of a document

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WAIS (Wide Area
Information Services)

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Let’s call it a day,
Thank you!