Figure $6$: A switch and four hosts, namely A$,$ B$,$ C$,$ and D$.$ Hosts A$,$ B$,$ C and D use interfaces

$1,2,3$ and $4$ to connect to the switch.

$($b$)$ The forwarding table of a learning switch is initially blank. Host D$,$ in Fig. $6,$ transmits

a frame intended for host B$.$ Fill out the entry in the switch forwarding table that is

populated as a result of this message. Justify your answer.

Table $6$: Fill out this switch forwarding table.

explain the reason in detail and at length