Multiplexing & Demultiplexing in UDP

Ports

Here’s a quick refresher on what ports are because that needs to be crystal clear in order for you to understand multiplexing and demultiplexing.

• Sockets, which are gateways to applications, are identified by a combination of an IP address and a 16-bit port number. That means $2^{16}= 65536$ port numbers exist. However, they start from port $0$ so they exist in the range of $0-65535$.