1. Mgt 240 Lecture The Internet: Computing at ND March 22, 2005

2. What is the Internet? Global computer network Global computer network Ad hoc linkage of many networks that adhere to basic standards Ad hoc linkage of many networks that adhere to basic standards TCP/IP TCP/IP No single entity is in charge of the internet No single entity is in charge of the internet Perpetually evolving Perpetually evolving Started as a DOD project Started as a DOD project

3. How the Internet Works Internet Protocol (IP) Internet Protocol (IP) Standard for assigning computer addresses Standard for assigning computer addresses All computers connected to the internet have an IP address All computers connected to the internet have an IP address Transport Control Protocol Transport Control Protocol Standard for controlling communications between two computers Standard for controlling communications between two computers

4. Routing Messages Over the Internet

5. Three Ways to Access the Internet

6. How We Use the Internet Use of internet constantly evolving Use of internet constantly evolving Some of the many uses: Some of the many uses: Sending email Sending email Exchanging files or data Exchanging files or data Making phone calls Making phone calls Commerce Commerce Others? Others?

7. Newer Consumer Uses of the Internet Entertainment downloads Entertainment downloads Mobile access Mobile access Bill paying and online banking Bill paying and online banking Others? Others?

8. How Businesses Use the Internet Communications Communications Voice over IP Voice over IP Teleconferencing Teleconferencing Email Email Wide area network Wide area network Extranet Extranet Electronic data interchange Electronic data interchange Virtual private network Virtual private network Electronic marketplaces or exchanges Electronic marketplaces or exchanges

9. How Businesses Use the Internet Local area network Local area network Intranet Intranet Knowledge management Knowledge management Document management Document management Web-enabled applications Web-enabled applications Customer-facing applications Customer-facing applications Ecommerce sites Ecommerce sites Customer service Customer service

10. U.S. Internet Usage by Age, Gender, Region, and Income

11. Summary of Internet Services

12. E-mail SMTP – simple mail transfer protocol SMTP – simple mail transfer protocol SMTP – simple mail transfer protocol SMTP – simple mail transfer protocol IMAP (internet message access protocol) IMAP (internet message access protocol) IMAP (internet message access protocol) IMAP (internet message access protocol) Stores mail on server Stores mail on server Allows use of server-based folders Allows use of server-based folders Can access mail from any computer that can access server Can access mail from any computer that can access server POP (post office protocol) POP (post office protocol) POP (post office protocol) POP (post office protocol) Stores mail on server only until you access it with an email client Stores mail on server only until you access it with an email client Designed to download mail to your pc Designed to download mail to your pc Folders on pc Folders on pc

13. E-mail at ND Server-based email: Webmail Server-based email: WebmailWebmail Access mail on the server Access mail on the server Secure connection to server and user authentication Secure connection to server and user authentication Folders Folders Address book Address book Filters Filters Directory service Directory service Quota on mail server Quota on mail server Quota on mail server Quota on mail server Soft quota of 50MB Soft quota of 50MB Hard quota of 250MB Hard quota of 250MB

14. E-mail at ND PC-based email: Netscape, Eudora, Microsoft Outlook or Outlook Express PC-based email: Netscape, Eudora, Microsoft Outlook or Outlook Express Obtaining an email client Obtaining an email client Obtaining an email client Obtaining an email client E-mail client set up instructions E-mail client set up instructions E-mail client set up instructions E-mail client set up instructions PC-based email clients allow you to PC-based email clients allow you to Secure connection to the mail server and user authentication Secure connection to the mail server and user authentication Access your email on the server Access your email on the server Download your email to your PC Download your email to your PC Organize your email into folders on your PC Organize your email into folders on your PC Send, receive, categorize emails Send, receive, categorize emails

15. The World Wide Web An Internet service comprising tens of thousands of independently owned computers that work together as one. Based on standards that web servers and web browsers understand: Hypertext transfer protocol (HTTP) Hypertext transfer protocol (HTTP)HTTP Hypertext markup language (HTML) Hypertext markup language (HTML)HTML Uniform Resource Locator (URL) Uniform Resource Locator (URL)URL Standard for web addresses Standard for web addresses http – high level protocol used http – high level protocol used www – web server www – web server nd.edu – domain name nd.edu – domain name

16. Sample HTML

17. URL Examples University of Notre Dame University of Notre Dame University of Notre Dame University of Notre Dame The White House The White House The White House The White House WhiteHouse.com WhiteHouse.com WhiteHouse.com

18. U.S. Top-Level Domain Affiliations.aeroAviation.bizBusiness Organizations.comCommercial.coopCo-Operative Organizations.eduEducational.govUS Government.infoOpen TLD.intInternational Organizations.milUS Dept of Defense.museumMuseums.namePersonal.netNetworks.orgOrganizations

19. Search Engine

20. Web Resources at ND ND Web Central ND Web Central ND Web Central ND Web Central Using shared file space to publish a web site Using shared file space to publish a web site Using shared file space to publish a web site Using shared file space to publish a web site

21. Web Resources at ND Creating a personal web page Creating a personal web page Create an html file named index.html Create an html file named index.html Designate either the n: or h: drive as your preferred web site location Designate either the n: or h: drive as your preferred web site location Designate either the n: or h: drive as your preferred web site location Designate either the n: or h: drive as your preferred web site location Place this file in your www folder on the drive you have chosen Place this file in your www folder on the drive you have chosen Now you should see the file when you type the url: http://www.nd.edu/~yournetid Now you should see the file when you type the url: http://www.nd.edu/~yournetid http://www.nd.edu/~yournetid All other files that you link to your web page must also be placed in this folder All other files that you link to your web page must also be placed in this folder Limiting access to Notre Dame community Limiting access to Notre Dame community Limiting access to Notre Dame community Limiting access to Notre Dame community

22. File Transfer Protocol Standard for transferring files over the internet Standard for transferring files over the internet Can be used to access your H: or N: drive from any computer as an alternative to WebFile Can be used to access your H: or N: drive from any computer as an alternative to WebFile Will be using ftp to upload web files to the web server when working on your web assignments and projects Will be using ftp to upload web files to the web server when working on your web assignments and projects There are a number of ways to use ftp There are a number of ways to use ftp

23. FTP Terminology Hosts and Clients The machine on which you start FTP becomes the “client” The machine you access with FTP becomes the “host” Also, sometimes the client is called the “local” machine, and the host is called the “remote” machine

24. FTP In order for a machine to be a host for you, that machine must be set up to accept you as a client. Typically, this is done by the system administrator. Once this is done, you will be required to enter a login and password so that the host machine recognizes you as an approved client. Uploading and Downloading When you transfer a file from the client machine to the host machine, you are “uploading” the file. When you transfer a file from the host machine to the client machine, you are “downloading” the file.

25. Using FTP in Dreamweaver

27. FTP Using Your Browser Let’s say you’re sitting in an airport and you would like to be able to work on some of your AFS files via the internet, but you are using a machine that does not an FTP client program This is no problem, because you can use a Netscape or Explorer web browser as a client also All you need to do is enter the FTP address of the host in the ‘Address’ box of your browser. This is what your FTP address should look like: ftp://username@darwin.cc.nd.edu

28. FTP Using Your Browser Once you enter the FTP address, you will be asked to supply the required password. You will then be able to see the folders of your AFS space within the web browser. Downloading Files: You must first right -click on the file in the host directory and then either open it or save it to a folder in your client directory. Uploading Files: However, you may upload a file by clicking on a file in the client directory and dragging it to the host directory.

29. FTP Using F-Secure One of the easiest ways to use FTP is through a software package called F-secure, which can be downloaded for free from the Notre Dame OIT software package download pageNotre Dame OIT software package download page This page can be accessed through: http://www.nd.edu/~ndoit/software/ Click on ‘Software Downloads’ Scroll down to ‘F-Secure for Windows’ and double click. Now follow the downloading instructions, and you are in business.

30. FTP Using F-Secure F-Secure is an excellent way to easily transfer files between a host and client machine because it provides a very intuitive interface. You can transfer files between drives by click and drag. When you first open F-Secure (open F-Secure SSH File Transfer), you will see at the bottom of the interface “Not Connected”. So now you’ve got to connect to a host (remote) drive by entering the host name or the IP address of the host machine.

31. F-Secure: Entering the FTP Address You need to know the FTP address of the host machine that you are trying to access. For example: darwin.cc.nd.edu Click on “Quick Access” Enter darwin.cc.nd.edu for the Host Name/IP address Then type in your user name (NetID): for example, dballou Click ‘Connect.’ Now a window will pop up requesting your password. Enter the correct AFS password, and then you will be connected.

32. F-Secure Now that you are connected to the host using F-Secure, transferring files between the host and client is a snap All you need to do to transfer a file is to select it—you can select multiple files by holding down the ctrl key while selecting—and drag it from one drive to the other Or you can use the upload/download from the toolbar Depending on the size of the file and the speed of your internet connection, the transfer of the file can take seconds or many minutes

33. F-Secure If you are using a dial-up modem, be very careful of transferring huge data files--you’ll end up waiting for quite a while! However, if you have a high speed connection, even very large files can be transferred relatively quickly. You can also open a file to view by right clicking on the file in the host directory and selecting ‘Open.’ You may also save and delete files directly within F-Secure.