Consider the following host address configurations and referring to Figure $2-$ Output

from netstat.

Host A: Port $36408,$ IP address: $192\mathrm{.}168\mathrm{.}1\mathrm{.}100$ and MAC address:

$08$:$00$:$27$:$15$:$9f$:$33$

Host B: Port $25,$ IP address: $192\mathrm{.}168\mathrm{.}1\mathrm{.}200$ and MAC address: $08$:$00$:$27$:$9$e:$97$:$73$

Figure $2$ shows output from running the netstat command separately on each of the

hosts, A and B$.$

Figure $2-$ Output from netstat.

Question continues on next page.

$($a$)$ There are values missing from this output listing which are identifiable by

the letters A through to F inclusively. Assuming the application on Host A has

requested a connection to the application on Host $B,$ use the appropriate

addressing information provided for each host to replace each letter.

$(12$ marks$)$

$($b$)$ Identify which lines, $1,2$ and $3,$ relate to the client TCP entity and which relate

to the server TCP entity. Justify your answer.

$(6$ marks$)$

$($c$)$ If a non$-$zero value appeared in column labelled Recv$-$Q on either lines $2$ or $3,$

explain what this value would represent and, explain what would have to

happen within either application for this value to return to zero. In your answer,

identify any socket primitives called within the application.

$(3$ marks$)$

$($d$)$ Identify the name of the ranges from which the client and server port numbers

are derived.

$(4$ marks$)$