$1-$ What are the five layers in the Internet protocol stack? What are the principal responsibilities of each

of these layers?

$2-$ How big is the MAC address space? The IPv$4$ address space? The IPv$6$ address space?

$3-$ Consider Figure $5\mathrm{.}33$ in problem P$14.$ Provide MAC addresses and IP addresses for the interfaces at

Host A$,$ both routers, and Host F$.$ Suppose Host A sends a datagram to Host F$.$ Give the source and

destination MAC addresses in the frame encapsulating this IP datagram as the frame is transmitted $($i$)$

from $A$ to the left router, $($ii$)$ from the left router to the right router, $($iii$)$ from the right router to $F.$

Also give the source and destination IP addresses in the IP datagram encapsulated within the frame

at each of these points in time.