Transcript Document

The Internet in Education
•Objectives
•Introduction
•Overview
–The World Wide Web
–Web Page v. Web Site v. Portal
•Unique and Compelling Characteristics
•Navigation
•Hyperlinks
Objectives
•Efficient use of Universal Resource Locators
(URL).
•Difference between:
–Web Page.
–Web Site.
–Portal.
•Recognize Unique and Compelling
Properties of the Internet.
Introduction
The Internet is a large collection of
computer networks, which are tied
together so that users can share
their vast resources.
Introduction
The Internet offers:
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Global Electronic Mail (email).
Knowledge Navigation.
File Exchange.
Discussion Groups.
Live Conferencing.
Introduction
• The Internet uses TCP/IP (Transmission
Control Protocol / Internet Protocol) to
control communication between
computers in the network.
• The Internet is a global network of
computers that communicate using
common languages and protocols.
Introduction
The four most important characteristics of
the Internet as an educational tool are:
– Offers access to Real Time Data.
– Allows students to collaborate in research
projects, making the classroom an open
research laboratory.
– Allows students to publish their work.
– Allows access to primary sources of
information.
The World Wide Web (www)
•Is an Internet browser, developed at CERN
(The European Center for Research in
High-Energy Physics – Switzerland).
•The www is a graphical network service of
the Internet that allows users to create web
pages, which are linked together by means
of Hypertext Transfer Protocol (http).
•HTTP uses hyperlinks (hotspot) to
navigate.
Web Pages
•Web Pages are hypertext documents that
are formatted using Hypertext Markup
Language (HTML).
•Web Pages have unique web addresses
called Uniform Resource Locator (URL).
Uniform Resource Locator
(URL)
URL is a naming convention that uniquely
identifies:
–The Internet Transfer Protocol.
–The Type of Internet Address.
–The Computer in the Internet where the Web
Site is found (Domain).
–The Type of Domain where the Page is found.
URL
Type of Protocol
WWW address
http://www.mdcc.edu.us
Domain
Domain Type
Country Code
URL
Each URL is an Internet Protocol (IP)
address, which consists of four sets of
numbers, each between 0 and 255,
separated by periods.
e.g.
http://www.mdcc.edu
(147.70.150.172)
Web Site
Is a group of web pages found in a computer
with access to the Internet. A web site is
characterized by having its own customized
home page, which allows navigation
through the site.
Portal
Specially developed gateways used mainly
to address educational purposes.
Gateways are commercially available domains or
trees that provide a read only access to the Internet
(America On-Line, CompuServ).
Electronic Mail (email)
Electronic mail (e-mail) is the oldest
component of the Internet. It was originally
designed as the only communication
medium for computers in the ARPANET
(1960’s).
Electronic Mail (email)
Tool used for communication between
computers in the Internet.
Email allows communication between:
–Two individuals (personal email)
–An individual and a group (Group email)
Electronic Mail (email)
Email is a low investment / high return
strategy for enhancing and maintaining
local or global one-to-one contact with other
people.
Electronic Mail (email)
What happens when you press the “send”
button?
–Source establishes connection to destination machine
(port 25).
–Destination machine accepts incoming connection and
sends email to the proper mailbox.
–If message cannot be delivered an error is reported.
Electronic Mail (email)
Group email involves setting up a Personal
Distribution List, which allows the posting of
messages to large groups of people; however, when
a member of the list replies to a message, the
message is by default delivered to the original
sender.
This shortcoming can be overcome by the use of
ListServ, Majordomo or Local Newsgroups.
Electronic Mail (email)
ListServ
•Mailing list software that can be used for
making files publicly accessible by email.
Electronic Mail (email)
Majordomo
• Software package for managing public
email distribution lists.
• Allows one or more individuals to use a
single distribution list from multiple
computing platforms.
Electronic Mail (email)
Local Newsgroups
A good way to communicate with a large
group of people sharing the same interests.
Electronic Mail (email)
Drawbacks:
–Anonymity
–Privacy
Electronic Mail (email)
Electronic Mail (email)
Anonymity
The right of a person not to reveal his/her
true identity
Electronic Mail (email)
Privacy
The control an individual has over the kind
of personal information to be released and
to whom this information should be made
available.
Electronic Mail (email)
Risks:
–Eavesdropping
–Monitoring
–Manipulation of someone’s messages
–Misrepresentation of someone’s identity
Electronic Mail (email)
E-mails are stored in:
–Mail servers
–Relays
–Temporary files
Electronic Mail (email)
E-mail Protocols:
–Simple Mail Transfer Protocol (SMTP)
–Post Office Protocol (POP)
–Internet Message Access Protocol (IMAP)
Electronic Mail (email)
E-mail Etiquette - Netiquette
Set of general rules developed to minimize
the risks of mistakes or embarrassing errors
when sending emails.
http://www.mdcc.edu/ctd/train/outlook/mailetiquette.htm