The LAN in Fig. $6$ consists of two self$-$learning Ethernet switches. Initially the switching

tables are empty.

At time t $=1$ a message is sent from the source H to the destination J$.$ The destination

J then sends a response to H$.$

At time t $=2$ a message is sent from the source F to the destination E$.$ The destination

E then sends a response to F$.$

At time t $=3$ a message is sent from the source K to the destination F$.$ The destination

F then sends a response to K$.$

At time t $=4$ a message is sent from the source I to the destination D$.$ The destination

D then sends a response to I.

i$)$ At time t $=1,$ what is the entry in S$1$ when the message is sent from the source?

$($ii$)$ At time t $=1,$ what is the entry in S$1$ when the response is sent back from the

destination?

$($iii$)$ At time t $=1,$ what is the entry in S$2$ when the message is sent from the source?

$($iv$)$ At time t $=1,$ what is the entry in S$2$ when the message is sent back, from the

destination?

$($v$)$ At time t $=2,$ what is the entry in S$1$ when the message is sent from the source?

$($vi$)$ At time t $=2,$ what is the entry in S$1$ when the response is sent back from the

destination?

$($vii$)$ At time t $=2,$ what is the entry in S$2$ when the message is sent from the source?

$($viii$)$ At time t $=2,$ what is the entry in S$2$ when the response is sent from the destination?

$($ix$)$ At time t $=3,$ what is the entry in S$1$ when the message is sent from the source?

$($x$)$ At time t $=3,$ what is then entry in S$2$ when the message is sent from the source?

$($xi$)$ At time t $=3,$ what is the entry in S$2$ when the response is sent back from the

destination?

$($xii$)$ At time t $=4,$ what is the entry in S$1$ when the message is sent from the source?

$($xiii$)$ At time t $=4,$ what is ten entry in S$1$ when the response is sent back from the

destination?