Crossover Academy Pro

Building Capacity for Success

On the Court • In School • For Life 

Course 5: Computer Smart

Behind the Scenes: How the Internet Actually Works

Note: Privacy law necessitates a warning that whenever a person follows external links, such as watching videos, he or she may be exposed to unintended third party tracking. 


  • This course is based on Khan Academy's program: Internet 101.
  • You must obtain a Crossover user name and password so that your work can be tracked and documented. If you already have these credentials, check with Mrs. Hanley to be sure these will log you in as part of Crossover. If you have forgotten your login credentials, Mrs. Hanley can recover them for you.  
  • Go to: The Khan Academy web site will open to the exact page you need in a separate browser window, which means this page will remain open in a tab behind it.
  • Make sure you log in before watching any videos. If someone else is still logged in on the computer you are using, you must sign that person out and then log yourself in. Otherwise, that person will get credit for your work!
  • Scroll down to Internet 101.
  • There are 6 lessons. Each lesson consists of one video.
  • When you complete each video, return to this page by clicking its tab in your browser  and take that lesson's quiz.
  • To receive credit for a lesson, you must listen to each video completely to the end and pass the quiz with a score of 80% or higher.
  • Remember: Watch the entire video. If you close a video before the end, your progress report on Khan Academy will not show credit for that video.
  • Helpful Tip: Each video has a transcript. If you get stuck on a quiz question, you may be able to find the answer in the transcript. You'll find the "Transcript" button next to the "About" button under the video.
  • When all the lessons are complete (80% or higher), you have completed this course.
  • You may take a quiz up to three times in order to pass it.

Lesson 1: Wires, Cables, and WIFI

Lesson 4: HTTP and HTML

Software engineer Tess Winlock introduces how the physical infrastructure of the Internet moves information. 

Tumblr founder David Karp and Xbox program manager Jasmine Lawrence give a detailed description of how files and web pages are sent and received using HTTP and HTML.

Lesson 2: IP Addresses and DNS

Lesson 5: Encryption and Public Keys

The co-founder of the Internet Vint Cerf and software engineer Paola Mejia explain the ins and outs of how networks talk to each other.

Mia Epner, who works on security for a US national intelligence agency, explains how cryptography allows for the secure transfer of data online. This video explains 256-bit encryption, public and private keys, SSL & TLS, and HTTPS. 

Lesson 3: Packet, Routers, and Reliability

Lesson 6: Cyber Security and Crime

Spotify engineer Lynn Root and Vint Cerf, Father of the Internet, explain how information on the Internet is broken down into packets, and how to ensure that information is reliably received.

Google Security Princess Parisa Tabriz and Jenny Martin from Symantec introduce the most common types of cyber crime, including viruses, malware, DDOS attacks, and phishing scams. 

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Crossover Mission Training is a division of Ocean East Publishing. The compilation of materials contained on this web site are provided by Ocean East Publishing for use by Crossover Mission, Inc. employees, volunteers, and members.