Unit 1 Lesson 13


#1

Can someone explain/clarify one of the images for me.
U1L13 Resource - HTTP and Abstraction on the Internet
Page 2
There is a graphic with HTTP and DNS side by side connecting to TCP.

Why is that? Why not one over the other?


Lesson 13 HTTP and Abstraction
#2

HTTP and DNS work side by side. The HTTP is the protocol a client computer would use to communicate over the internet through the DNS. The DNS also uses this protocol to communicate with other computers. They are not dependent on each other. They work together to make the top layer of the internet. I hope this makes sense!


#3

Help!!!

This is my first year teaching this class and I am a Spanish teacher. I do not understand what to do in this lesson. Could someone explain to me step by step what to do? I am panicking right now!!!
The following are the instructions. I really do not know what or how to do this.

"You will use your browser’s developer tools to discover what kind of HTTP traffic is associated with visiting different types of websites. You and your partner are going to look at least 5 different types of websites:

  1. http://example.com – a very simple web page. Use this first to investigate developer tools.
  2. A “static”; website like: Wikipedia
  3. A news website like: ESPN.com, BuzzFeed, the New York Times, etc.
  4. A streaming site like: YouTube, or Spotify
  5. A site that accepts user input like: twitter, facebook, email, google docs.

For each type of website below, follow these steps:

  1. Monitor the HTTP traffic generated by loading the page.
  2. Once the page has loaded, poke around with the other information the developer tools let you see about the data coming in. What about the protocols can you see?
  3. Interact with the website by clicking links or using other functionality on the site, noting how this affects the HTTP traffic.
  4. Observe other things like:
  • Total amount of data received
  • Number of HTTP requests actually generated by loading one page
  • Total time to load the page.
  • Types of data received through HTTP (it’s more than just HTML)

Thank you so, so much


#4

Hello @rossiai

The key part of this activity involves observing traffic using a browser’s developer tools. For Google Chrome, those can be found in the more options icon, in the top right hand of the browser. Click “More Tools” then “Developer Tools”. The Developer Tools should pop up. To view the Network traffic, the tab can be selected at the top of the Developer Tools. If it does not show up, click the >> icon and then select Network. To view the traffic on a page, reload the page and watch what happens!

Cheers!
~ Hannah


#5

Thank you so, so much. It really helped me!


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                09/03/18, 9:46:48 AM

#6

Hi, there. Would you also help me with this?

The following line is from a Wikipedia article. I really do not understand what it means.

“the quad-dotted IP address 192.0.2.235 represents the 32-bit [decimal] number 3221226219" https://en.wikipedia.org/wiki/IPv4

My problem is that I thought that 192.0.2.235 was already in base 10.


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                09/05/18, 5:01:33 PM

#7

Hi @rossiai

Long answer: I had to look this up myself, and I found this website to have a helpful explanation, although it does require a lot of reading.

Short answer: There is math involved giving weight to each part of the quad-dotted IP address when converting to one single decimal number.

Cheers!
~ Hannah


#8

Thank you Hannah. I will try to go over it this weekend. I could not find anything myself. I am not sure I will understand, but I will give it a try.


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                09/06/18, 4:49:45 PM