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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

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mgt 240 lecture

Mgt 240 Lecture

The Internet: Computing at ND

March 22, 2005

what is the internet
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
how the internet works
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
how we use the internet
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?
newer consumer uses of the internet
Newer Consumer Uses of the Internet
  • Entertainment downloads
  • Mobile access
  • Bill paying and online banking
  • Others?
how businesses use the internet
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
how businesses use the internet9
How Businesses Use the Internet
  • Local area network
    • Intranet
    • Knowledge management
    • Document management
    • Web-enabled applications
  • Customer-facing applications
    • Ecommerce sites
    • Customer service
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
e mail at nd
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
e mail at nd14
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
the world wide web
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
      • – domain name
url examples
URL Examples
  • University of Notre Dame
  • The White House
web resources at nd
Web Resources at ND
  • ND Web Central
  • Using shared file space to publish a web site
web resources at nd21
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:
    • All other files that you link to your web page must also be placed in this folder
  • Limiting access to Notre Dame community
file transfer protocol
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
ftp terminology
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
  • 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.
ftp using your browser
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 using your browser28
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.
ftp using f secure
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:
  • Click on ‘Software Downloads’
  • Scroll down to ‘F-Secure for Windows’ and double click.
  • Now follow the downloading instructions, and you are in business.
ftp using f secure30
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.
f secure entering the ftp address
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:
  • Click on “Quick Access”
  • Enter 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.
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
f secure33
  • 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.