Unit 2: The Internet
2.1 The Internet and the Web
- In this lesson, the goal is to build student understanding of the Internet as a set of computers exchanging bits in the form of packets. Students will learn to identify the components of their digital footprint. To provide a hook, students compare the designs, strengths, and weaknesses of their favorite web pages. In this context students use an unplugged activity to understand (in broad brushstrokes) the content and flow of data when browsing the Web. They compare results from different search engines and learn to refine their search techniques. They review how to assess the trustworthiness of web-based media and consider the data flow that permits targeted advertisements. Students employ appropriate tools to explore the hierarchical nature of DNS and IP. Students identify ways that a web developer’s decisions affect the user and ways that the user’s decisions impact society. The tree structure of web documents is introduced alongside HTML and CSS. Paired key encryption and authentication are introduced with an unplugged activity.
2.2 Shopping and Social on the Web
2.3 Security and Cryptography
- The goal of this lesson is for students to personally invest in maintaining online security and to improve their personal cyber security hygiene. Students focus on cyber security from the perspectives of the user, the software developer, the business, the nation, and the citizen. In the team competition at the end of the lesson, students explore parallel strands in encryption and security. Encryption is used as a route to explore the efficiency of algorithms and how the time for an algorithm to execute can be dependent on its input.