QC$4)$ The following Data Link Layer frame has been captured using Wireshark.

Captured Frame

$00000019213$a $2$e $720011$ ff $08$ a$7$ c$708004500$

$0010012881$ de $400040063599$ c$0$ a $0101$ c$0$ a$8$

$00200107005005$ fe $0609$ oc $5$a $4$e $9638015011$

$0030192074120000485454502$f $312$e $312032$

$00403030204$ f $6$b $0$d $0$a $5365727665723$a $206$ d

$00506963726$f $5$f $680$d $0$a frame truncated here

The first four digits are line numbers and the actual data is shown in black. Use the frame format information sheet attached to this question paper to analyse this data and answer the following:

a$)$ Briefly explain the purpose of the preamble and CRC field.

$(2$ marks$)$

b$)$ What meant by the term is the PDU and what information does this field provide about the encapsulated data?

$(2$ marks$)$

c$)$ What is the MAC address of the device sending the captured frame?

$(2$ marks$)$

d$)$ How many hops can the encapsulated packet travel before it is discarded by a router? $(2$ marks$)$

e$)$ What is the IP address of the server?

$(2$ marks$)$

f$)$ Which ports and application layer protocol are involved in this transmission?

$(5$ marks$)$

g$)$ What action is being initiated at the Transport layer and by which host?

$(5$ marks$)$