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CSIS-116 Lab 1: Understanding the Internet and WWW, Study notes of Computer Science

A lab guide for a course on internet and www fundamentals. Students are expected to work in pairs to research and answer questions related to the internet, www, urls, web servers, and host connections. The lab includes activities, discussions, and lectures to help build a functional understanding of these concepts.

Typology: Study notes

Pre 2010

Uploaded on 08/09/2009

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CSIS-116: Lab 1 Internet and WWW Crash Course (Fall 2005)
Names___________________________________________________
Introduction
In this lab you will work with a partner. This lab is a mixture of research, activities, discussions,
and lectures to help build a functional understanding of the Internet and WWW so that you can
create and deploy websites.
WWW vs. Internet
The World Wide Web (WWW) is not a synonym for the Internet. One is part of the other.
One is physical while the other is abstract.
Question 1: Do a Google search and try to find some descriptive definitions for both the Internet
and the WWW. Discuss you findings with your partner, write down concise definitions for the
two terms, and briefly outline the differences between the Internet and the WWW.
Internet Map
Now that you might have a better understanding of the Internet, it important to have a picture in
your head of what the Internet really is?
Question 2: Using the WWW, try to find a picture, diagram, or map of the Internet. Print it and
share it with the class. We’ll take a moment to examine and discuss all the maps we were able to
find.
Question 3: Do you think there exists an accurate and complete map of all the Internet hosts?
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CSIS-116: Lab 1 Internet and WWW Crash Course (Fall 2005)

Names___________________________________________________ Introduction In this lab you will work with a partner. This lab is a mixture of research, activities, discussions, and lectures to help build a functional understanding of the Internet and WWW so that you can create and deploy websites. WWW vs. Internet The World Wide Web (WWW) is not a synonym for the Internet. One is part of the other. One is physical while the other is abstract. Question 1 : Do a Google search and try to find some descriptive definitions for both the Internet and the WWW. Discuss you findings with your partner, write down concise definitions for the two terms, and briefly outline the differences between the Internet and the WWW. Internet Map Now that you might have a better understanding of the Internet, it important to have a picture in your head of what the Internet really is? Question 2 : Using the WWW, try to find a picture, diagram, or map of the Internet. Print it and share it with the class. We’ll take a moment to examine and discuss all the maps we were able to find. Question 3 : Do you think there exists an accurate and complete map of all the Internet hosts?

URLs Type in the following URL into your web browser http://www.cs.siena.edu/~ebreimer/courses/csis-116-f05/labs/lab1.jpg Examine the picture. Challenge Questions : Try to quickly answer the following question with your partner. Afterwards, we will discuss the answers with the class. If you are totally clueless just skip the question, but as we discuss the answers, write down some notes so you remember the answers.

  1. What do you think the connections in the picture represent? Physical network links or virtual hyperlinks? (Circle one)
  2. Is this a picture of the WWW or the Internet or Neither? _____________
  3. What does URL stand for?______________________
  4. What is a URL?
  5. In the URL above what does http stand for?
  6. Why do most URLs have www in them?
  7. What is the difference between cs.siena.edu and siena.edu? Why do we need the cs in front of siena.edu?
  8. For that matter, why do we need siena before .edu?
  9. Why is there a tilde ~ before ebreimer?
  10. What is the difference between using a dot (i.e., siena.edu) vs. a slash (i.e., ~ebreimer/courses)?
  11. What is the difference between .jpg and .edu?

How are hosts connected? On your desktop, find the putty icon. Open the putty program Type turing.cs.siena.edu as the host name and connect to the host. When prompted type your user name and password Type traceroute www.rpi.edu Wait about 4 minutes Question 6 : What is twtelecom.net? _____________________ In the putty window type traceroute www.stanford.edu. Wait about 4 minutes Question 7 : Notice that we hop from alby .twtelecom.net to nycl .twtelecom.net to chcg .twtelecom.net. What does alby, nycl, and chcg stand for?




Do a traceroute on a couple of different URLs. Question 8 : How are hosts located? Do you think there is a central authority that knows the location of every host on the Internet? Who provides the information to help you find hosts? Discuss your thoughts with your partner and then we’ll talk about it as a group. Question 9 : How do URLs help with the process of finding hosts and web pages?

Who is responsible for hosts and domains? Go to www.dnsstuff.com Do a WhoIS lookup on siena.edu. Do a WhoIS lookup on several other domains that you like (yahoo.com, cnn.com, etc.) Get Domain Info on www.siena.edu Get Domain Infor on several other domains that you like Do a trace route on www.siena.edu Compare the results of this trace route to the one you did using putty. Question 10 : Why are the results different? Putting it all together? Now, we will take a tour and I will show you how the CS department web server is connected to the Internet. Later, I will draw a picture of our web server and show you how it is connected to the WWW and how you can add content to the WWW. Use this space and the back page to take copious notes: