the internet and the world wide web. the internet millions of computers all around the world no one...
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The Internet and the World Wide Web
The Internet
Millions of Computers all around the world No one person, company, or entity owns or
controls the Internet.
The Internet’s Hardware Owned or Shared by thousands of private
and public organizations Supercomputers called NAPs (Network
Access Points), that serve as major hubs. NAPs are connect to each other and to
Regional Routers through the largest lines of the Internet call “Backbones”
Regional Routers are connect to Regional Networks
The Internet’s Hardware Regional Networks connect to the various
ISP.
How do you connect to the internet from home?
Computers on the Internet Request Data Provide Data Help Send Data Along the Network
Computers on the Internet Your personal computer at your house is
an example of a computer that primarily requests data, called a Client.
Computers that provide data are called Servers, since they “Serve” data to other computers.
Computers that help information travel across the Internet are called Routers.
Every time data takes a turn on the Internet, a Router is there to send it in the right direction.
The Internet
Services on the Internet Voice Over IP (Internet Protocol) Online Muli-Player Gaming Internet Relay Chat(IRC)
Services on the Internet Peer to Peer File Sharing Video Conferencing Electronic Mail (e-mail)
Services on the Internet FTP (File Transfer Protocol) World Wide Web
How the WWW Works
http:// - This is a “Protocol Prefix” that designates the file being requested as accessible via Hypertext Transfer Protocol.
www - designates a requested file as World Wide Web document, originally needed to distinguish between Web files and other Internet files, this is often no longer needed. For example, you can go to edulaunch’s web site by typing http://www. edulaunch.com or just http:// edulaunch.com
edulaunch - Domain name that points to the server computer of the edulaunch web site.
.com – Domain Name Extension designated for web sites with a commercial focus
student_showcase - Directory or folder within which the web page being requested is located.
bachelor_bet.html - This is the name of the exact file requested. You may be wondering: What is the purpose of slashes? They signify that you are moving deeper within the web site by entering a new folder or directory. For example, the bachelor_bet.html file is inside the student showcase directory.
How the WWW WorksDomain Name Extensions
The ending three-letter suffix of all top level domains are to designate what type of web site it is. Listed below are some of the most common domain extensions.
.com commercial use
.edu education and research
.gov governmental agencies
.mil military agencies
.net networks or ISPs
.org non-profit organizations
Country Code ExtensionsThere are now over 200 two-letter country code extensions. These designate a web site as originating from a certain country. For example, the web address of the London's famous metropolitan police - Scotland Yard is http://www.met.police.uk Notice the two-letter country code at the end(.uk).A few examples of Country Code Extensions are listed below.
.ar Argentina .il Israel .prPuerto
Rico
.br Brazil .in India .ru
Russian Federation
.cn China .it Italy .tw Taiwan
.es Spain .krSouth
Korea
.uk
United Kingdom
.ie Ireland .mx Mexico .usUnited
States
Searching the Web
Two Types of Web Searches Directories Search Engines
Search Engines
Method of searching that uses software programs to search the web and record information.
Programs Spiders Robots Crawlers Intelligent Agents
Search Engines
All the Web www.alltheweb.com Alta Vista www.altavista.com Ask Jeeves www.ask.com Google www.google.com HotBot www.hotbot.com Lycos www.lycos.com Wise Nut www.wisenut.com
How a Search Engine Works
Enter Your Request (Called a Query)
Request Compares it to the Search Engine (Database)
Search Engine Delivers List based on relevancy.
How Google Works
Information found on Google Inc.
Directories
Directory-based searches use people to search the web for similar web sites, they then place them in a directory. Most Popular Directory-Based Search Engine
www.yahoo.com
Directories
Directory-based searches use people to search the web for similar web sites, they then place them in a directory.
Getting the Whole Story?
Web searches only a cover around 20-40% of the web. Much of the content on the web is hidden through password protected sites, firewalls, Flash™ sites, databases, and other things that search engines can’t read.
Boolean Searching
Most People Just Type What They are Looking For
Best Way to Search the Web Allows the Search to be More Specific
Boolean Searching
Boolean Operative What it Does Exampleand (+) Retrieves only pages that
include all the keywords. Michael and Jordan, Michael + Jordan
or Retrieves pages containing any or all keywords.
Texas or Austin
and not (-) Retrieves pages containing one keyword but not the other.
Michael an not Jordan, Michael -Jordan
Boolean Searching
Boolean Operative What it Does ExamplePhrase Searching Only retrieve documents
where specified words appear in order, side by side..
"Remember the Alamo"
Plurals If you want to search for only the plural of a word you must type in in plural.
Concerts
Capitals If you want to search for the capitalized version of the word you should type the whole word in CAPS.
ROCKETS
Boolean Searching
Boolean Operative What it Does ExampleTitle Searching Searching only for web
page titles.+title:"Apostle Paul"
Domain Searching Searching for a specific web address within a domain
+domain:.com
Host Searching Searching a host for a specific page.
+host:www.ford.com
Boolean Searching
Boolean Operative What it Does ExampleURL Searching Searching web pages
where the keyword appears in the URL or the web site address.
+url:cars
Link Searching Finding what web sites are linked to a specific site.
link:www.ford.com
Web Searching Activities
Taken Over Common Research Tools Dictionary Thesaurus
Replaced Trips to the Library for Professional Research
The Web has become the new phone book.
Web Searching Activities
You will complete two short Web search projects. First, you will use the Web to make a personal phone directory. The directory will contain the addresses and phone numbers of family and friends along with some helpful numbers from your local area. Second, you will use the Web to plan a trip. Included will be the route driven, the price and location of a rental car, the price and location of a hotel at your vacation destination and any stops or sights that will be taken in along the way.
Activity 1 – Making Your Own Phone Directory
The internet has many natural advantages over the traditional phonebook. Some of those advantages are: Internet directories contain the most current listings
available. Internet directories have access to all the nations
telephone books. Internet directories do not need storage space in your
home. Using internet directories you may search an entire state at
once.
Activity 1 – Making Your Own Phone Directory
In this activity you will construct your own personal directory. Included will be phone numbers and addresses of family members and friends, local schools, restaurants, car repair shops etc.
Activity 2 – Planning Your Vacation on the Web In this project you will use the internet to plan a fictitious car trip.
Conditions for the trip include: Your destination must be at least 600 miles from your school and no more
than 1200 miles You will choose a hotel at your destination that costs less than $140 per
night. You will find exact directions from your school to the hotel at your
destination. You will find a mid-size car to rent with unlimited miles for at a cost of no
more than $500.00. You will plan at least 2 activities at your destination and determine the cost
of each. Your vacation will take place from June 1st to June 6th. You will need a six
night hotel stay and a car rental for 6 days.
Activity 2 – Planning Your Vacation on the Web
In this project you will use the internet to plan a fictitious car trip.
Step One - Choose a Destination
Step Two - Choose Lodging at Your Destination
Step Three - Choose a Route
Step Four - Reserve Your Rental Car
Step Five - Plan Your Vacation Activities
Web Content
Who’s Behind the Web Page? Anyone can publish to the web
No Laws to Monitor or Regulate its accuracy Always a Good Idea to Double-Check all
information with a 2nd Source.
http://www.britannica.com/
Web Security
Internet security is a branch of computer security specifically related to the Internet. Its objective is to establish rules and measures to use against attacks over the Internet.[1] The Internet represents an insecure channel for exchanging information leading to a high risk of intrusion or fraud, such as phishing.[2] Different methods have been used to protect the transfer of data, including encryption.
Web Security
Web Tracking When a web site makes a record of your visit
“Cookie” – A small text file that helps with web tracking Cookies enable the web site to determine how often
you have: Visited Their Site Date & Time of Your Last Visit Specific Pages viewed on Site
Web Security
Web Tracking Example: Amazon.com, you may have seen a message on the site that
appears to be customized for you.
“Hello, we thought you might be interested in these CDs”, then the CDs listed are all your favorites.
A cookie by itself is not a bad thing. In fact they can make surfing the web a richer experience and many well known
sites will not function properly without them.
Web Security
Advertising Spyware Advertising spyware is software installed on a
computer without the computer owner’s knowledge or permission.
Web Security
Advertising Spyware Uses Gathered Information to:
Download Advertisements (Pop-Up Banners) Identify Theft Computer Damage
Web Security
Online Purchases & Encryption Shop From a Secure PC Shop Smart, and Only at Sites You Know
& Trust Shop with Your Credit Card Consider Alternative Payment Methods
One-time use Get a Handle on Spam
Web Security
Online Purchases & Encryption Encryption- Converts your text into gibberish
File would need to be decrypt or translate it back to original format
Majority of all reputable sites now offer encryption services.
Look for the Lock Icon at the bottomw of the browser window.
Encrypt your Own Files Use PGP (Pretty Good Privacy)
Web Security
Viruses A program designed to replicate and spread
to as many computers as possible. Immediately Visible Working unseen on your computer for months
Web Security
Viruses Email Attachments
DO NOT OPEN ANY FILE ATTACHMENT UNTIL YOU HAVE CONFIREMD ITS ORIGIN
Even From a Friend – Viruses will over take address books to spread itself.
Web Security
Viruses Trojan Horse
Pretends to be something it is not, such as a product update or a free software download. Once you open it, the virus will begin to execute its programming.
Keep Anti-Virus Software on your computer & up to date.
The Future of the WWWIt will be almost impossible to predict what the Web will be like in the future. Ten years ago,
few people would have predicted the rapid growth of the web in size and content. There are three things you can bet on.
1) More and more people will use the web. Not only is the world’s population increasing, but computer prices keep falling. As the “computer generation” grows into adulthood, replacing the "baby-boom" generation in the work force, web use will increase.
2) The Web will get faster and faster. Not too long ago, you would have been happy to have a 28.8 Kilobytes per/sec modem. Then 56k modems came along. Now there is DSL and Cable offering speeds over 1000k. Over 70% of high school students in suburbia America already has a high speed connection. There is already talk about an Internet2, bringing technology enabling everyone will have the speed that only today’s backbone lines enjoy.
3) The Web will grow continually grow more wireless. Popping up all over the United States are “hot spots”, areas where a business, school, or home is broadcasting their Internet connection. All laptops are now equipped with Mobile Technology to automatically connect to any wireless Internet signal it can find. Many restaurants are broadcasting a wireless signal in an effort to attract more customers. Many predict that within a few years, you may not need a wired connection at all.
The Internet and the World Wide Web