Question $6$ Consider the network in Fig. $7$ that contains four IPv$6$ subnets, connected by a mix of IPv$6-$only routers, IPv$4-$only routers and dual$-$capable IPv$6/1$Pv$4$ routers. Suppose that a host of subnet D wants to send an $113$v$6$ datagram to a host on subnet B$.$ Assume that the forwarding between these two hosts goes along the path: D $-->$ F $-->$ b $-->$a $-->$ c $-->$ B

A$.$ Is the datagram being forwarded from D to Fan IPv$4$ or IPv$6$ datagram? $(1$ mark$)$

B$.$ What is the source address of this D to Fdatagram? $(1$ mark$)$

C$.$ What is the destination address of this D to F datagram? $(1$ mark$)$

D$.$ Is this D to F datagram encapsulating another datagram? Yes or No$.(1$ mark$)$

E$.$ Is the datagram being forwarded from F to b an IPv$4$ or IPv$6$ datagram? What is its source and destination address of this F to b datagram? $(3$ marks$)$

F$.$ Is this F to b datagram encapsulating another datagram? Yes or No$.(1$ mark$)$

G$.$ What router is the 'tunnel entrance'? Give the router's letter. $(1$ mark$)$

H$.$ What router is the 'tunnel exit? Give the router's letter.