(1) What is the UDP protocol?The UDP protocol, which stands for User Datagram Protocol, is a connectionless protocol used in networking. It allows data to be sent without establishing a connection, making it faster but less reliable than connection-oriented protocols like TCP. UDP is often used for applications where speed is crucial and
UDP (User Datagram Protocol) is a user datagram protocol. It is a connectionless transport layer protocol within the OSI seven-layer model, providing simple and unreliable information transmission services. The UDP protocol is a connectionless network protocol used to support network applications that require the transmission of data between computers, including many client/server mode network applications such as network video conferencing systems.
(2) What are the characteristics of UDP?
1. UDP is a connectionless protocol, meaning no connection is established between the source port and the destination port before data transmission.
2. Since UDP does not establish a connection for transmission, it does not need to maintain connection state.
3. The UDP packet header is very short, only 8 bytes.
4. UDP uses best-effort delivery, which does not guarantee reliable delivery.
5. UDP is widely used in multimedia applications, such as QQ video, internet calls, etc.
(3) The format of the UDP header
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The UDP datagram header is 8 bytes in total.
Source port: The port used to transmit the data packet
Destination port: The port to which the data packet will be transmitted
UDP length: The byte length of the data packet
Checksum: Used to ensure the integrity of the UDP header and data section
Data: The data encapsulated by UDP, including the headers of the application layer protocol and user-sent data
(4) Capturing UDP data packets
Configure Wireshark and log into QQ, and you can capture data packets of the UDP protocol
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Among them, OICQ is the protocol used by Tencent QQ, which is based on the UDP protocol.
(5) Analyzing the UDP protocol
Just select any one of the above packets
