Introduction
簡介
Imagine you're a network engineer at a bustling multinational corporation. Recently, you've noticed an uptick in employee complaints about connectivity issues. Sarah, a senior manager, reports frequent disconnections during virtual meetings. Meanwhile, Tom, a sales representative, faces slow network speeds on his smartphone as he walks around the building to meet clients.
假設您是一家繁忙的跨國企業的網路工程師。最近，您注意到員工對連線問題的抱怨逐漸增加。資深經理 Sarah 反映她在視訊會議期間經常斷線。與此同時，業務代表 Tom 在辦公室內走動拜訪客戶時，發現他的智慧型手機網路速度很慢。
You realize the following:
您意識到以下幾點：
- The company's wireless network struggles under the heavy demand of a modern, mobile workforce.公司的無線網路在現代行動化員工的高度需求下顯得吃力。
- Traditional wired connections are not feasible for employees like Tom who rely heavily on mobile devices that lack traditional RJ-45 (Ethernet) connectors.對於像 Tom 這樣高度依賴缺乏傳統 RJ-45（乙太網路）接頭的行動裝置的員工來說，傳統的有線連線並不可行。
- As more devices connect wirelessly, the complexity of managing network performance and security increases.隨著越來越多裝置以無線方式連線，管理網路效能與安全性的複雜度也隨之提高。
In the figure, Tom is connecting through walls and glass to the only wireless access point (AP) in the office. Sarah’s connection to the same AP is being affected by a nearby microwave oven.
圖中，Tom 需要穿透牆壁與玻璃，才能連上辦公室裡唯一的無線基地台（AP）。而 Sarah 連往同一台 AP 的連線，則受到附近一台微波爐的干擾。
 | How do network engineers solve these things? 網路工程師該如何解決這些問題？ |
Network engineers need to grasp the fundamentals of wireless networks, understand different wireless architectures, and efficiently implement and manage these systems.
網路工程師需要掌握無線網路的基礎知識、了解不同的無線架構，並能有效地實作與管理這些系統。
In this course, you will learn the following:
在本課程中，您將學習以下內容：
- What are the different wireless technologies.有哪些不同的無線技術。
- The basics of radio signals and electromagnetic waves.無線電訊號與電磁波的基本原理。
- What are the various types of wireless architectures and deployment options.有哪些不同類型的無線架構與部署選項。
- What are the different Wi-Fi frequency bands and channels.有哪些不同的 Wi-Fi 頻帶與頻道。
- What options do you have for wireless management.無線管理有哪些選項可供選擇。
The figure shows that Tom and Sarah are now connecting to nearby 5 GHz APs.
圖中顯示 Tom 與 Sarah 現在改連接到附近的 5 GHz AP。