Preface Network Protocols When we connect to the internet using our mobile phones, we use many network protocols. Starting from connecting the phone to WiFi, the 802.11 (i.e., WLAN) protocol is used to access the network; the phone automatically obtains network configuration using the DHCP protocol, and only after obtaining the configuration can the phone … Read more
What Is a Communication Network There is always a network around us, such as telephone networks, telegraph networks, television networks, computer networks, etc.; even within our bodies, there are many network systems, such as the nervous system and the digestive system. The most typical representative is the computer network, which is a combination of computer … Read more
This article is a submission from a friend, Han Shijun. If you have excellent articles you would like to submit, feel free to contact me. Everyone relies on network communication every day, but how do these devices communicate with each other? I wrote this article so you can read it from thousands of miles away. … Read more
To better explain this abstract topic, we will analyze the same issue from different perspectives. Remember the story of the blind men and the elephant? Some say the elephant is like a large tree, while others say it resembles a fan. These views are certainly one-sided, but if we gather all these perspectives, we can … Read more
(Click the public account above to quickly follow) Source: Wang Dongyu Link: http://wangdy.blog.51cto.com/3845563/1588379 OSI Reference Model OSI RM: Open System Interconnection Reference Model The OSI reference model has the following advantages: Simplifies related network operations; Provides compatibility and standard interfaces between devices; Promotes standardization efforts; Structurally separable; Easy to implement and maintain. Since the 1960s, … Read more
From the OSI network model perspective, fieldbus networks generally implement only the 1 layer (Physical Layer), the 2 layer (Data Link Layer), and the 7 layer (Application Layer). Because fieldbus typically includes only one network segment, it does not require the 3 layer (Transport Layer) and the 4 layer (Network Layer), nor does it need … Read more