2.1 Principles of the Application Layer

2.2 The Web and HTTP (part 1)

3.4-1 Principles of Reliable Data Transfer (Part 1)

1.2 The network edge

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2.4 The Domain Name System (DNS)

4.1 Introduction to the Network Layer

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4.3 The Internet Protocol, part 2

2.3 Email

TCP/IP and Subnet Masking

1.5 Layering, encapsulation

3.4-2 Principles of Reliable Data Transfer (Part 2)

OAuth 2.0 and OpenID Connect (in plain English)

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