$6\mathrm{.}4-9$ Network$-$ and Link$-$layer addressing: an end$-$to$-$end$-$scenario $(2$c$).$ 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 $A$ to node $C.$ Match the source$/$destination network$-$ or link$-$layer address at the location $(6)$ by choosing a value from the pulldown list. $[$Note: You can find more examples of problems similar to this here.$]$

What is the source MAC address on

The MAC address of the switch the frame at point $(4)?$ immediately left of location $(6).$

What is the destination MAC address

$2\mathrm{.}72-9$E$-4$A$-31-9$C$-42$

on the frame at point $(4)?$

$128\mathrm{.}119\mathrm{.}240\mathrm{.}52$

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

$4\mathrm{.}128\mathrm{.}119\mathrm{.}97\mathrm{.}194$