UDP (User Datagram Protocol) is a connectionless protocol used for fast transmission of data packets over the internet. Unlike TCP, UDP does not establish a connection before sending data, making it faster but less reliable. UDP is commonly used for applications that require real-time data transmission, such as video streaming, online gaming, and VoIP (Voice over Internet Protocol) services.
Common UDP port numbers include:
Port 53: Used for DNS (Domain Name System) queries, which translate human-readable domain names (like www.example.com) into IP addresses.
Port 67 and 68: Used for DHCP (Dynamic Host Configuration Protocol), which automatically assigns IP addresses and other network configuration parameters to devices on a network.
Port 123: Used for NTP (Network Time Protocol), which synchronizes the clocks of computers over a network.
Port 161: Used for SNMP (Simple Network Management Protocol), which is used to manage and monitor network devices.
Port 5004 and 5005: Commonly used for RTP (Real-time Transport Protocol) traffic, which is used for transmitting real-time data such as audio and video.
Port 514: Used for syslog, a standard for message logging.
For example, when you're streaming a video on YouTube, the video data might be transmitted using UDP over port 1935 (commonly used for RTMP, Real-Time Messaging Protocol).
In the context of cloud services, Tencent Cloud offers a variety of services that might utilize UDP, such as its Cloud Video Service for live streaming, which could leverage UDP for its real-time data transmission needs.