Introduction

There is a story in the "Sutra of One Hundred Parables": A wealthy man saw someone's three-story building was tall, magnificent, spacious and beautiful, and was very envious, so he called craftsmen to build such a house. But when the craftsmen started measuring the land, making adobe bricks, and preparing to build, the wealthy man said he couldn't understand, saying "I don't need the bottom two floors, just build the third floor for me now." People at the time laughed when they heard this: "How can there be a castle in the air in this world?" Do you find this joke funny? Or boring?

Back to contemporary times, there's a 5W1H analysis method that many people have heard of. According to Baidu, this was first proposed by American political scientist Lasswell in 1932. To fully grasp something, one must ask questions from six aspects: Why, What, Where, When, Who, and How.

Back to the 2020s, in China, the booming IT industry, our economy is developing rapidly and technology is catching up. From enterprises to individuals, from the richest to ordinary people, there's generally impatience, hoping to reach the sky in one step, get rich overnight. IT development is changing with each passing day, with new technologies, new concepts, and new things emerging endlessly. Many practitioners approach IT technology and products with a quick-fix mentality, having only a superficial understanding of What and Why, but confidently believing they can quickly build and use products.

This article is about cloud network interconnection. Readers don't need to understand cloud, but need to understand some networking. If you're confused reading the description of traditional networks below, there's no need to waste time reading further - networking basics run deep.