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Mgt 240 Lecture The Internet: Computing at ND March 22, 2005 What is the Internet? Global computer network Ad hoc linkage of many networks that adhere to basic standards TCP/IP No single entity is in charge of the internet Perpetually evolving Started as a DOD project

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Mgt 240 Lecture

The Internet: Computing at ND

March 22, 2005


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What is the Internet?

  • Global computer network

  • Ad hoc linkage of many networks that adhere to basic standards

    • TCP/IP

  • No single entity is in charge of the internet

  • Perpetually evolving

  • Started as a DOD project


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How the Internet Works

  • Internet Protocol (IP)

    • Standard for assigning computer addresses

    • All computers connected to the internet have an IP address

  • Transport Control Protocol

    • Standard for controlling communications between two computers




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How We Use the Internet

  • Use of internet constantly evolving

  • Some of the many uses:

    • Sending email

    • Exchanging files or data

    • Making phone calls

    • Commerce

    • Others?


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Newer Consumer Uses of the Internet

  • Entertainment downloads

  • Mobile access

  • Bill paying and online banking

  • Others?


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How Businesses Use the Internet

  • Communications

    • Voice over IP

    • Teleconferencing

    • Email

  • Wide area network

    • Extranet

    • Electronic data interchange

    • Virtual private network

    • Electronic marketplaces or exchanges


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How Businesses Use the Internet

  • Local area network

    • Intranet

    • Knowledge management

    • Document management

    • Web-enabled applications

  • Customer-facing applications

    • Ecommerce sites

    • Customer service




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E-mail

  • SMTP – simple mail transfer protocol

  • IMAP (internet message access protocol)

    • Stores mail on server

    • Allows use of server-based folders

    • Can access mail from any computer that can access server

  • POP (post office protocol)

    • Stores mail on server only until you access it with an email client

    • Designed to download mail to your pc

    • Folders on pc


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E-mail at ND

  • Server-based email: Webmail

    • Access mail on the server

      • Secure connection to server and user authentication

      • Folders

      • Address book

      • Filters

      • Directory service

      • Quota on mail server

        • Soft quota of 50MB

        • Hard quota of 250MB


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E-mail at ND

  • PC-based email: Netscape, Eudora, Microsoft Outlook or Outlook Express

    • Obtaining an email client

    • E-mail client set up instructions

    • PC-based email clients allow you to

      • Secure connection to the mail server and user authentication

      • Access your email on the server

      • Download your email to your PC

      • Organize your email into folders on your PC

      • Send, receive, categorize emails


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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 markup language (HTML)

  • Uniform Resource Locator (URL)

    • Standard for web addresses

      • http – high level protocol used

      • www – web server

      • nd.edu – domain name



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URL Examples

  • University of Notre Dame

  • The White House

  • WhiteHouse.com




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Web Resources at ND

  • ND Web Central

  • Using shared file space to publish a web site


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Web Resources at ND

  • Creating a personal web page

    • Create an html file named index.html

    • 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

    • Now you should see the file when you type the url: http://www.nd.edu/~yournetid

    • All other files that you link to your web page must also be placed in this folder

  • Limiting access to Notre Dame community


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File Transfer Protocol

  • 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

  • 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


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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


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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.




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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://[email protected]


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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.


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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 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.


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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.


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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.


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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


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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.


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