1. Phenomenon Description: The user cannot connect to the network, and the local connection icon in the system tray shows an exclamation mark indicating that the IP is restricted. 2. Cause Analysis 1. Many users do not understand TCP/IP and do not know how to set parameters such as “IP address”, “subnet mask”, and “default … Read more
Click the blue text Follow us In daily life, when shopping online or mailing an item, we need to fill in both parties’ addresses, contact information, whether insurance is needed, and other details. Additionally, the courier company may have other regulations to be added to the purchase and mailing details. The purpose of this is … Read more
Source: https://juejin.cn/user/3931509313252552/postse In communication and IT work, networking is essential, and the most important protocol in the network is TCP. Whether in actual work or in written exams and interviews, you can’t escape TCP. I have read documents related to TCP in the RFC, examined the source code related to TCP in Linux, and looked … Read more
In network technology, a port generally has two meanings: first, it refers to the physical interface (hardware) between computers and other devices. For example, interfaces like RJ-45 ports and SC ports used to connect other network devices such as switches and routers. Second, it refers to the logical virtual ports (software), which typically refer to … Read more
Introduction Network Protocols When we connect to the internet using our mobile phones, we utilize many network protocols. Starting from the connection to WiFi, we use the 802.11 (i.e., WLAN) protocol to connect to the network; the phone automatically obtains network configuration using the DHCP protocol, and only after getting the configuration can the phone … Read more
Source:Network Editor | Ning Ning Quality Article 741 Words 3 Minutes ARP: Address Resolution Protocol (ARP), a TCP/IP protocol that obtains the physical address based on the IP address. CLNP: Connectionless Network Protocol (CLNP). CRC: Cyclic Redundancy Check (CRC), a hash function that generates a short fixed-length checksum based on network packets or computer files, … Read more
29 Tuesday June 2021 Verification Room As we all know, the TCP/IP protocol suite is the foundation of the Internet and is currently the most popular networking form. Among them, the Hypertext Transfer Protocol (HTTP), which operates at the application layer of TCP/IP, is an application protocol that can be used for distributed, collaborative, and … Read more
01 Content Summary Content validity TCP/IP Illustrated, Volume 1: Protocols mainly discusses the TCP/IP protocol, explaining the reasons for the definition of the TCP/IP protocol suite with numerous examples, as well as its application and operation in various operating systems. The second edition retains Stevens’ excellent knowledge system and writing style, while new author Kevin … Read more
Click the above Network Engineer Club Select “Add to Favorites” First-hand news, check it in time The story should start from the beginning. In the summer of 1973, two young scientists, Vinton Cerf and Robert Kahn, began to work on a method for communication between different machines in the newly born computer networks. Soon after, … Read more
Fundamentals of Networking 1、OSI（Open System Interconnection）Open System Interconnection Model Seven-layer model: Layer 1: Physical Layer : Transmission of raw bit streams over mechanical, electronic, and timing interfaces communication channels Layer 2: Data Link Layer: Physical addressing, while transforming the raw bit stream into logical transmission lines Layer 3: Network Layer: Controls the operation of subnets, … Read more