01 【Common Ground】 RS-232, RS-422, and RS-485 all belong to UART, which stands for Universal Asynchronous Receiver/Transmitter. They can complete the communication process using only two signal lines (Rx and Tx); However, due to the different voltage levels used by each, when converting from UART to RS-232, RS-422, or RS-485, a chip such as SP3232E … Read more
Past and Present RS-485, what does RS mean? It is an abbreviation for Recommended Standard, which means a recommended standard. 485 is the standard identification number, and there is no need to delve into why this identification number is set. RS-485 is also known as ANSI/TIA/EIA-485, these prefixes are abbreviations of standard associations’ names, for … Read more
Hello everyone, I am Feiying. The recruitment process at Huawei consists of one written test, three technical interviews, and one HR interview. Compared to other major internet companies, Huawei’s interview difficulty is generally lower. Today, I will share two classic questions encountered by a student during Huawei’s technical interview: Introduce the HTTP protocol and What … Read more
I just don’t love you anymore. This song that I have been looping for a week now sounds like 5G singing to TCP/IP. As we all know, 4G LTE is fully IP-based, with upper-layer transmission using the TCP/IP protocol (as shown in the figure below). ▲LTE User Plane Protocol Architecture However, this familiar architecture has … Read more
Why TCP/IP Exists All around the world, various computers running different operating systems serve their purposes. However, the methods they use to express the same information can vary greatly. It’s akin to how God confused the languages of people in the Bible, preventing them from cooperating. Computer users realized that individual computers would not be … Read more
Introduction This article covers the basics of the TCP/IP protocol, focusing on the content, functions of the TCP/IP protocol suite, and foundational knowledge related to the three common network protocols: TCP, UDP, and IP. Content The TCP/IP protocol suite is developed from the OSI seven-layer model. The existence of the OSI reference model has the … Read more
Join the group once, and receive tutorials for free long-term, no paid tutorials. Tutorial ListSee the bottom menu of the WeChat public account Reply in the WeChat group: WeChat Group; QQ Group:16004488 WeChat Public Account: Computer and Network Security ID: Computer-network TCP/IP is the protocol currently used on the Internet. The reason it has achieved … 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
Author: MobMsg, a Senior Full-Stack Engineer and Partner at the Architect Community! TCP/IP Protocol Family The core protocol of the Internet is TCP/IP, widely used in local area networks and wide area networks, with a development history of over 20 years, and is the current international standard. TCP/IP is a protocol family that includes various … Read more
Click the “Five-Minute Algorithm Learning” above and select the “Star” public account Heavyweight content delivered first time When it comes to the protocols we encounter most in computer networks, we cannot ignore the TCP/IP protocol, which is also the most famous protocol on the Internet. Let’s talk about the TCP/IP protocol together. Historical Background of … Read more