Can you explain how network process/connection is established and how it's terminated?>

When a client process on one system wants to establish a connection with a server process on another system, it first creates a socket using the socket system call. The client then calls the connect system call, passing the address of the server as an argument. This causes a three-way handshake to occur between the client and server, where the two systems exchange information to establish a connection.

Once the connection is established, the client and server can exchange data using the read and write system calls. When the connection is no longer needed, the client or server can terminate the connection by calling the close system call on the socket.