Master Socket

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listening socket" (a.k.a. a "master socket")
binds it to a port and waits for a connection request.
client connects to this master socket and gets a connection socket
reuses this client socket for persistent connection
think of it like an air traffic control
- you first communicate with air traffic control (master socket) to get the landing lane (client socket)
- but you don't land cargo (client message) at the air traffic control (master socket)

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