$6\mathrm{.}4-2$Network$-$ and Link$-$layer addressing: an end$-$to$-$end$-$scenario $(1$b$).$ Consider the network shown below. The IP and MAC addresses are shown for hosts A$,$ B$,$ C and D$,$ as well as for the router's interfaces. Consider an IP datagram being sent from node B to node D$.$ Match the source$/$destination network$-$ or link$-$layer address at the location $(4)$ by choosing a value from the pulldown list.

What is the destination MAC address on the frame at point $(4)?$

What is the source MAC address on the frame at point $(4)?$

What is the source IP

The MAC address of the switch between points $(4)$ and $(5)$

$72-9E-4A-31-9C-42$

$12811950107$

What is the source MAC address on the frame at point $(4)?$

What is the source IP address of the datagram at point $(4)?$

What is the destination IP address of the datagram at point $(4)?$