from sender $S$ to receiver the segment sent from:

i$.$ A to S

ii$.$ B to S

iii. S to A

v$.$ Is it possible that the source por. A to B same host?

from A to S is the same as that from B to S $?$ How about if they are the packet P $3$ is sent to PCl from the PCl $(172.31\mathrm{.}80\mathrm{.}6)$ and packet P $2$ from PC$2(172\mathrm{.}31\mathrm{.}90\mathrm{.}6)$ to google server $(200\mathrm{.}10\mathrm{.}55\mathrm{.}10).$ Also, server $($nats$-172\mathrm{.}31\mathrm{.}100\mathrm{.}14,110\mathrm{.}10$ and perver, and packet P$4$ is sent to PC$2$ from the Google server. P$1,$ P$2,$ P$3,$ P$4$ pass through NAT $4$: An organization is assigned a classless Show table at nats while $Pl,P2,P3,P4$ pass. $[15]$