This problem is based on following TCP client program. $(1)$ To get responses from

the server, the TCP client program should register for a source port number, but in the

program, this step seems to be missing. Without this port number, how can the client

program get responses? $(2)$ Which line of the code triggers the three$-$way handshake

protocol? $(3)$ There are two sendall$()$ calls in this client program, will each call

trigger a separate TCP packet?

#$!/$bin$/$env python$3$

import socket

tcp $=$ socket.socket$($socket$.$AF$\_$INET, socket.SOCK$\_$STREAM$)$

tcp$.$connect$((10\mathrm{.}0\mathrm{.}2\mathrm{.}69,9090))$

tcp$.$sendall$($b$"$Hello Server!

$")$

tcp$.$sendall$($b$"$Hello Again!

$")$

tcp$.$close$()$