Lesson 2.1 The Internet and the Web

Lesson 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 and 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. Students exchange keys and messages, use Python functions to encrypt and decrypt, and explain how paired key encryption and certification authorities provide security and authentication.