The most important skills of network engineers are solid foundation and very open thinking, solid micro knowledge and outstanding macro capabilities. No matter what certificate you have, you cannot be a good network engineer without these two points.

The first step of QOS must be to classify the data, and the data with the same transmission quality must be one type. Do your best to classify the data according to the default rules.

This question is particularly valuable for discussion and is shared with interested students. When a computer receives a message, it needs to deliver it to a specific process. The method of computer operating system management process is very similar to that of public security system to manage population.

IP address changes are nothing more than manual configuration changes and automatic configuration changes. Communication is good, no user will manually modify their IP. However, if the user has to modify the IP, there is nothing. Before the modification is successful, the operating system will reset the current connection, then modify the IP, and then reconnect after the modification is completed.

HTTP

A hosting server (Host Server), if hosting a plaintext http service, only relying on the hostname and domain fields in the Http Header, you can tell which website the client wants to connect to, and then return the web page requested by the client to Client.

Some people say that the safety and reliability of flying is very high, the probability of accident is only a few millionths, but it can not guarantee 100% safety.

Problem Description

UDP protocol does not need to establish a link, then I can link to other people to send data at will?

If udp is connectionless, can I send data to anyone? If he only writes the receiving function, isn't it just casual communication?

English is LAN (Local Area Network), Local, local, local. For example, someone in Shanghai asks: Are you a local? Subtext: Are you born and raised in Shanghai? This is a regional concept, so the local area network is also a regional concept. For example, the home network is a small local area network, which generally includes a free optical cat sent by telecommunications. 

Will the packets captured by Wireshark have two RSTs in one connection?

Two RST records appeared in 247,248. Was wireshark displaying inaccurately, or was it actually sent twice.