Transcript internet
INTERNET By Ms. Ford Information obtained from: Internet for Dummies, John R. Levine et. al as well as the internet – Ask Jeeves & various company sites. Internet Defined A system that lets computers all over the world talk to each other and share information. Getting Connected • Step 1 – Decide which type of internet connection you will use: Types of Internet Connections Service Type Speed Description Telephone line 28.8 - 56 Kbps Normal telephone line Digital Up to 9 Mbps subscriber line (DSL) Cable Modem Up to 2.5 Mbps Satellite “T” Lines High peed connection across regular telephone wires Uses television cable ? Uses satellite transmission Up to 45 Mbps Super high-speed Kbps = thousands of bits per second Mbps = Millions of bits per seconds Getting Connected • Step 2 – Determine who you will use for your Internet Service Provider Internet Service ProvidersISP’s connect your computer to the internet. Examples: • America Online (AOL) • Compuserve • NetZero • PeoplePC • Yahoo DSL Getting Connected • Step 3 – Install the communication software from your Internet Service Provider Getting Connected • Step 4 – Install a Web Browser program. Web BrowsersSince the internet includes text, pictures, sound and other information stored on computers all over the world, you need a browser program to display the pages. • Examples: • Internet Explorer • Netscape Navigator Internet Explorer • Title Bar = Name of the document • Menu Bar = Provides options related to Web Pages • Toolbar = Icons for single-click access • Address Bar/Location Bar = Contains the URL • Go Button = Connects you to the address Internet Explorer Continued • Document Window = Active Web Page • Status Bar = Shows progress of Web Page Transactions • Access Indicator = Small picture, when animated, it means that your browser is accessing data. Web Pages • Web Pages are written and published by: • Associations & Organizations (.org) • Government Agencies (.gov) • Schools & Universities (.edu) • Corporations & Private Businesses (.com) • Network Providers (.net) • Military Organizations (.mil) Uniform Resource LocatorURL is the standard format used for addressing pages and other stuff on the internet. http://www.ecps.org/block http – HyperText Transfer Protocol, the way in which world wide web pages are transferred www – World Wide Web ecps – Domain Name of Host Server .org – Type of entity (organization) /block – Page on website • www.purdue.edu • www-World Wide Web • purdue – domain name of host server • edu – education website • www.cia.gov/cia/publications • • • • www – World Wide Web cia – domain name of host server gov – government website cia/publications – page on website Website• A collection of Web pages devoted to a single topic or organization. Web Pages An ordinary text page that is coded with a programming language called Hypertext Markup Language (HTML). This language lets the text include codes that define fonts, the layout, graphics etc. HyperLinksA hypertext connection that can take you to another document or another part of the same document. • Appear as text or pictures that are a different color, are underlined or both. http://www.ecps.org/block • Images can also be linked to other places. Searching the Web • Search Engines – Organizations that have indexed the entire WWW. • Yahoo • category-based • have about a million other things linked to their site, such as a Yahooligans, a search engine for kids. • Can use dictionary by typing ``define ironic'', • Can receive weather forecasts by typing ``weather East Chicago Indiana''. • Google • ranks pages by relevance, so first pages are usually the ones that bear most directly on the topic • has indexes of images,current news stories from online sources around the world. Etc. Searching the Web – Cont. To sharpen search request, follow these tips: 1. Bookmark site once find it. 2. Always use the most unique keyword phrase to describe what you are looking for. 3. Capitalization can determine what you will find, lowercase results will include both uppercase and lowercase. 4. Place in quotations, words that should appear together in search results. 5. To connect words include either a + sign directly before the word or use the word and to connect the two words. Miscellaneous Web Information • Know the difference between email addresses & Website addresses: • anything with an @ sign (i.e. [email protected], [email protected]) is an email address, anything with www or http is a WWW address (i.e. http://www.nwrel.org, www.washingtonpost.com) • Deal with the dreaded 404 errors: File Not Found • Check your spelling - Web addresses must be exact • Start going back in the URL - you may be able to find what you need by backing up directories • If a webpage doesn't come up or is taking a long time to load, try the Refresh or Reload button sometimes this will load the page better. Miscellaneous Web Information • Plug-ins are additional programs that help your computer to run or view extra programs on the Web. • Adobe Acrobat PDF Files. • Real Video files. This allows you to watch videos and hear audio clips on the web. • Zip files. Files with a .zip extension are files which have been compressed to save space. To view these files, you must "unzip" them by using a specific software program. Miscellaneous Web Information • Most company Websites use the format of http://www.companyname.com - try this before using a search engine or directory. • Viruses are everywhere.. Be careful about files you download or that you receive attached to emails. Opening an email can't infect your computer, but opening a file attached to an email can. Make sure you've got virus protection software installed and that you update their "virus definition" files at least monthly.