IT skills : compose URLs, beware of phishing

1. URLs – uniform resource locators IT skills: compose URLs, beware of phishing IT concepts: parts of a URL, secure http, shortened URL, phishing, malware, domain name, directory, file name, extension, path, communication protocol This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.

2. Internet concepts Applications Implications Technology Internet skills Application development Content creation User skills Where does this topic fit?

3. URL, uniform resource locator http://som.csudh.edu/fac/lpress/shortbio.htm request page Server Client Click on the link and see what happens.

4. Four parts of the URL http://som.csudh.edu/fac/lpress/shortbio.htm http://som.csudh.edu/fac/lpress/shortbio.htm http://som.csudh.edu/fac/lpress/shortbio.htm http://som.csudh.edu/fac/lpress/shortbio.htm

5. http:// http://som.csudh.edu/fac/lpress/shortbio.htm

6. The domain name http://som.csudh.edu/fac/lpress/shortbio.htm

7. The directory http://som.csudh.edu/fac/lpress/shortbio.htm root * fac staff admin * . . . jdoe jsmith lpress

8. The file name http://som.csudh.edu/fac/lpress/shortbio.htm root fac staff admin . . . jdoe jsmith lpress shortbio.htm

9. URLs may be shortened http://www.csudh.edu/studentaffairs/financialaid/faq.shtml#apply_for_scholarships http://bit.ly/djeREW Click both links and see what happens. Try shortening a link of your own using the service at http://bit.ly.

10. Know the source of a shortened URL http://bit.ly/9dLHk5 Click the link and see what happens.

11. Know the source of a link Free money and fame Click the link and see what happens.

12. You can delete the http:// som.csudh.edu/fac/lpress/shortbio.htm Click the link and see what happens.

13. You can delete the file name http://som.csudh.edu/fac/lpress/ Click the link and see what happens.

14. Summary • This request is for a Web (http) server • The server program is running on a computer with the domain name som.csudh.edu • Look in a subdirectory called fac/lpress • If there is a file called shortbio.htm, send it back to the client to be displayed; if not, send an error message back to the client http://som.csudh.edu/fac/lpress/shortbio.htm Domain name = the unique name of a computer on the Internet

15. Self-study questions • 1. Without looking back, can you describe the four parts of a URL and explain what each means? • 2. If you accidentally misspell the domain name in our class URL: • http://som.csudX.edu/fac/lpress/275/index.htm • you get an error message. Explain why. • 3. If you accidentally misspell the file name in our class URL: • http://som.csudh.edu/fac/lpress/275/indeZ.htm • you get a different error message. Explain why it is different. • 4. These two URLs: • http://som.csudh.edu/fac/lpress/275/index.htm • http://som.csudh.edu/fac/lpress/275/ • Retrieve the same Web page. Explain why. • 5. The https protocol has been around for years. Why didn’t everyone use it instead of http from the start?