Encryption, Compression, Character Encoding, TLS/SSL, Certificates, JSON, XML, and Serialization

Learning Objectives

By the end of this chapter, you should be able to:

• Explain the role of the Presentation Layer in the OSI model.
• Understand how data is formatted before being transmitted.
• Explain encryption and why it protects sensitive information.
• Differentiate between symmetric and asymmetric encryption.
• Understand TLS and SSL and how secure communication is established.
• Explain what digital certificates are and why they are important.
• Understand compression and how it improves network performance.
• Explain character encoding standards such as ASCII and Unicode (UTF-8).
• Understand serialization and deserialization.
• Compare JSON and XML and know where each is commonly used.
• Relate these concepts to modern DevOps, cloud computing, APIs, Docker, Kubernetes, and AWS.

Introduction

Imagine you are sending a letter to someone in another country.

Before mailing it, you may:

• Write it in a language the recipient understands.