Explanatory Material: "Basic Knowledge of Short-Range Wireless Communication (Wi-Fi)"

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last updated：Dec 15, 2025

Introducing an overview and evolution of networks and communication methods with a focus on Wi-Fi. Security measures are also explained.

This document provides an overview of basic knowledge related to networks and wired/wireless communication, with a focus on Wi-Fi. Chapter 1 introduces the overview of networks, LANs, and the Internet. From Chapter 2 onwards, it explains the types of wireless communication, the procedures for communication, the evolution of LANs, connection examples, as well as the features, standards, and security measures of Wi-Fi. [Contents] 1. Communication Networks 2. Mechanism of Wireless Communication 3. Mechanism of LANs 4. Mechanism of the Internet 5. Wi-Fi Standards 6. Wi-Fi Connections and Extensions *The document can be viewed immediately by downloading the catalog.

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【Table of Contents (Excerpt)】 ■What is a Network?　　■What is a LAN?　　■What is the Internet? ■Transition from Terrestrial Analog Broadcasting　　■Short-range Wireless Communication Used in Daily Life ■What is Ethernet?　　■LAN and WAN　　■From TCP/IP to the Spread of the Internet ■Connecting to the Internet　　　　　　■Business Development on the Internet ■Using Wi-Fi Outside of Home or Office ■What is Public Wireless LAN (Free Wi-Fi)? ■What is SSID (Service Set Identifier)? ■Ensuring Security　　■Measures Against Information Risks