Unit 3 Internet Basics_3.02 The Information Superhighway.ppt
- 1. 3.02 The Information Superhighway Unit 3 Internet Basics
- 2. Introduction • In Lesson 3.01, you learned that computers are networked so that they can share data, programs, and devices. • A computer network may be small or it may be large; the largest network known to us, of course, is the Internet. • The World Wide Web is the collection of information that is available through the use of the Internet.
- 3. Introduction • Computers are organized and located on a network through their IP addresses. • Just like you have a home address where you can receive snail mail, your computer’s IP address allows email to find you. • When a web page is uploaded through a file server, the server computer’s IP address becomes part of that website’s URL address. • Because numbers are difficult to remember, most host computers apply for a domain name for their IP address.
- 4. Introduction • At the end of this lesson, you will be able to: – Describe networked computer functions (ACOS #1.B1) – Identify the parts of a URL – Apply Boolean logic to narrow Internet searches – Distinguish between search box and address box
- 5. Lesson: Untangling the Web • Computer Addresses – Known as Uniform Resource Locators (URL) – Organizes computers on the Internet • No two computers have the same URL address • Enables computers to be located
- 6. Lesson: Untangling the Web – Parts of the URL • Protocol • Machine Address (a name for its IP number) – Host computer, which is Web server – They accept requests from Web browsers • Folders – That need to be opened – To locate exact file being requested – Slashes (/) represent folders • Last part is the actual filename followed by file extension identifying the file as an HTML file – The basic structure of a URL is: – protocol://server-name.domain-name/directory/filename
- 7. Lesson: Untangling the Web • What is a Domain Name? – Gives a name to the server computer’s IP number – It identifies the computer that is a server – Have to apply for a domain name • With Internet provider • So that no machines can have the same address – A country code is sometimes, but not always, included • Example: .ac.ukindicates that it’s located on an academic server in the United Kingdom • Many U.S. servers do not have the country code in their UR
- 8. Lesson: Untangling the Web • Misc. – In the URL, a tilde ~ usually indicated a personal web directory rather than being part of the organization's official web site. – Slashes (/) represent directories – Generally speaking, the more directories, the more complex the site – Domain and server names • not always good clues about the source of information • People can call their servers any name they wish
- 9. Lesson: Searching the World Wide Web • The Difference Between Search Box and Address Box – There are two text boxes at the top of Web browsers; be sure to key into the correct box – If you know an exact URL address, key it in the Address Box – If you do not know an exact URL address and know only a topic that you want to search, key that search topic in the Search Box
- 10. Lesson: Searching the World Wide Web • The Difference Between Directories and Search Engines – Directories are human-compiled • Example: Yahoo – Search Engines are machine-compiled and has more content than Directories • Example: Google
- 11. Lesson: Searching the World Wide Web • Searching – Be as specific as possible – Because in broad searches, you will be overwhelmed with information – To narrow down searches • Use operators such as + and -between your search words • Use AND, OR, NOT between search words – To look for exact words in order, enclose them in “ “.
- 12. Lesson: Searching the World Wide Web • Boolean Searching – OR can be used to search for synonymous terms or concepts. – AND will retrieve records in which BOTH of the search terms are present – NOT excludes records from your search results
- 13. Lesson: Searching the World Wide Web • Now let’s see if you can identify the parts of a – URL, – a Web site, – and an e-mail message. • Go to Wisc-Online: Internet Components. – Enter your first and last name – Complete Internet Components Skills Check 3 » Take a screenshot once you complete it » Save to your F Drive in your Unit 3 Folder as » 3.02 Skills Check 3
- 14. Lesson: Boolean Logic • Much Internet database searching is based on the principles of Boolean logic. – Boolean logic refers to the relationship among search words, and is named for the British-born Irish mathematician George Boole. It is a way of revising your searches so that you will not be overwhelmed with information. – A Boolean search consists of three logical operators: • OR • AND • NOT
- 15. Lesson: Boolean Logic • Learn more about narrowing your Internet searches, – Go to: • Internet Tutorials: Boolean Searching on the Internet. • Scroll down to the bottom of the page – Take a screenshot of » Quick Comparison Chart: Full Boolean vs. Implied Boolean vs. Search Form » Save to your F Drive in your Unit 3 Folder as » 3.02 Boolean QC Chart
- 16. Lesson: Side Trip • You learned in Unit 1 that the “Brain” of your computer is the Central Processing Unit, and you have just completed the Computer Networking section.
- 17. Lesson: Side Trip • Have you ever thought about “how you think”?
- 18. Lesson: Side Trip • The Internet is a network of hyperlinked documents and your brain is a network of thoughts and ideas.
- 19. Lesson: Side Trip • Have you ever thought about something and that led you to think about something else — and that process continues until you end up thinking about something not at all related to your original thought?
- 20. Lesson: Side Trip • Well, that is how our brain works—it is a network of 100 billion nerve cells called neurons that act much like the electrical signals in your computer. Thoughts are networked together.
- 21. Lesson: Side Trip • That is why your teachers have you study concept maps. – A concept map is a special form of a web diagram for exploring knowledge and gathering and sharing information. • A concept map consists of nodes or cells that contain a concept, item or question and links (like hyperlinks). • The links are often labeled and they explain the relationship between the nodes. • How much do you know about your brain? – Take the How Stuff Works Brain Quiz and find out. • Take a screenshot at the end of the quiz after you click on See Results – Save to your F Drive Unit 3 Folder as » 3.02 How Stuff Works Brain Quiz
- 22. Summary • If you know a particular website’s URL, you can key that into the address box. • If you do not know the URL address, then conduct an Internet search using the search box. • When searching on the Internet, use techniques, such as the Boolean operators OR, AND, NOT, to narrow your searches so that you will not be overwhelmed with “hits”.
- 23. Task • Conduct an Internet search of Tim Berners Lee. – How many results did you find? – Now, revise your search and in the search box beside Tim Berners Lee, add the following NOT boolean operators: • NOT invented • NOT Web • NOT hyperlinks. – Your search should read as follows: » Tim Berners Lee NOT invented NOT Web NOT hyperlinks – How many search results are reported now? – Explain in your own words how a computer network is like your brain (Hint: Slide 18 & 20).
- 24. Task 1 Continued • Answer the 2 questions below as well. – How are computers located on a network? – You are interested in radiation but not nuclear radiation. Using Boolean Logic, how would you enter that into the search box? • Type out the questions and your answers to all 5 questions in complete sentences using proper English. – Save to your F Drive in your Unit 3 Folder as » 3.02 Searching the Web Dropbox.
- 25. Are you finished? • You should have 7things saved on your F Drive in your Unit 3 Folder. – 3.01 Network Tutorial – 3.01 How Networks Work – 3.01 History and Internet Dropbox – 3.02 Skills Check 3 – 3.02 Boolean QC Chart – 3.02 How Stuff Works Brain Quiz – 3.02 Searching the Web Dropbox. • So, are you finished?