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Ports and Their Multiplexing
In TCP/IP, a port is a communication endpoint used to identify a specific process or service running on a host. Ports are identified by a 16-bit number and can range from 0 to 65535.
TCP and UDP use port numbers to identify the source and destination of data. When data is transmitted over a TCP or UDP connection, the sender and receiver identify the port number associated with the application or service running on their respective hosts. This enables the operating system to direct the data to the appropriate process or service.
Multiplexing is the process of combining multiple data streams into a single connection. In TCP/IP, multiplexing is achieved through the use of ports. By assigning unique port numbers to different applications or services, multiple data streams can be transmitted over a single connection.
There are two types of ports in TCP/IP: well-known ports and dynamic or private ports. Well-known ports are those in the range of 0 to 1023 and are reserved for use by specific applications or services. For example, port 80 is reserved for HTTP (web browsing) and port 25 is reserved for SMTP (email).
Dynamic or private ports are those in the range of 1024 to 65535 and can be used by any application or service. When an application or service initiates a connection, it chooses a dynamic port number to use for the connection. Once the connection is established, the port number is used to identify the application or service running on the host.
Multiplexing allows multiple applications or services to share a single connection, which helps to conserve network resources and improve efficiency. However, it also introduces some overhead and can lead to congestion if too many applications or services are sharing a single connection.
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