Computer Networks Review Carla Duke Summer II 2011

Computer Networks Review Carla Duke Summer II, 2011

Contents Using the Web Internet Basics Searching 2 Duke, Carla Internet Communications Problems and Dangers 1/8/2022

Internet Communication Individual: Email Blogs & Vlogs (video blogs) Group: Chat rooms Webcasts Multiplayer online games Podcasts Instant messaging Forums, newsgroups, and listservs Wikis Social networks Voice over Internet (Vo. IP) 3 Duke, Carla 1/8/2022

Top 5 Internet Using Countries 450 400 350 300 250 200 150 100 50 0 Users (M) % Population China United Japan India Brazil States 4 Duke, Carla 1/8/2022

Internet Usage by Continent 1000 800 600 400 Usage (M) 200 % Population 5 ra ili a e op Eu r Au st ut h So N or th Am Am er er ic ic a a 0 Duke, Carla 1/8/2022

E-commerce Conducting business online B 2 C (business to customer) B 2 B (business to business) C 2 C (customer to customer) 6 Duke, Carla 1/8/2022

Internet Basics Finding an Internet Service Provider (ISP) Connected to Internet Dial-up connection Client Broadband connection Cable Satellite DSL Fiber optics Client Server Client Wifi 7 Duke, Carla Client 1/8/2022

Browsers Popular browsers: Internet Explorer Opera Firefox Chrome Browser Features: Tabbed browsing Bookmarking/favorites Searching: Search engine Subdirectories 8 Duke, Carla 1/8/2022

Websites Web site: Collection of web pages Home page or the index page Web page: Html (Hypertext Markup Language) document Unique address (URL) Hyperlinked 9 Duke, Carla 1/8/2022

URL Uniform Resource Locator (URL) Unique web page address Numeric address consisting of 4 groups of #’s (0 -255) • Ex. 124. 104. 96. 250 Components: Protocol (http) Domain name (www. ---). edu, . gov, . org=top level domain name Path or subdirectory 10 Duke, Carla 1/8/2022

Top-Level Domains 11 Duke, Carla Name Entity . commercial . educational . governmental . information . network . organization 1/8/2022

Search Engines Keyword searching Boolean operators: AND, OR and NOT 12 Duke, Carla 1/8/2022

Boolean Operators 13 Operator Examples Results AND Car AND Ford Only documents that contain both the words included in the results. Search engines assume that AND is used as a default. OR Car OR Ford Documents that contain either one OR both words are included in the results. Gives the greatest number of documents. NOT Car NOT Ford Only documents that contain the word Car, but NOT the word Ford. Combinations (Car AND Ford) NOT Gerald Documents that contain both Car AND Ford, but NOT any that reference Gerald Ford. Quotation marks “Lord of the Rings” Documents that contain the string “Lord of the Rings” in that exact order. Wildcard * Comp* Stands in place of a sequence of letters. Wildcard % Sm%th Stands in place of a single character. Duke, Carla 1/8/2022

Subdirectories Directories organized by subject Does not use keyword search Directory structure Breadcrumbs 14 Duke, Carla 1/8/2022

Problems and Dangers Virus Identity theft Privacy issues Spam- junk mail Malware- group term for malicious software Spyware- program attached to another program (hidden) Hoax- letter from Africa Phishing- letter requesting personal info that looks legit Cookies- small text file stored on your comp to “remember” you Adware and pop-ups- digitized advertising 15 Duke, Carla 1/8/2022

Resources Top right picture http: //en. wikipedia. org/wiki/List_of_Internet_toplevel_domains http: //internetworldstats. com/ 16 Duke, Carla 1/8/2022

Review Question #1 Click on the part of the URL that represents the top level domain. http: //www. twu. edu/math-computerscience/degrees-courses. asp 17 Duke, Carla 1/8/2022

Review Question #2 Which of the following is an internet communications protocol? http 20 Duke, Carla DSL . edu 1/8/2022

Contact Me Phone number: 214 -797 -4219 E-mail address: cduke 1@twu. edu 23 Duke, Carla 1/8/2022