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In modern packet-switched network , the source host segment long ,application layer message (for example an image or a music file )into smaller packet & send the packets into the network . the receiver then reassembles the packets back into the original message . we refer to this process as message segmentation consider a message that is 7.5*10^6 bits large that is to be sent from a source to destination ,through two packet router , suppose each link is 1.5 MBPS Ignore propagation queuing & processing delays
a) Consider sending the message from source to destination without message segmentation .
How long does it take to make the message from the source host to the first packet switch?
Keeping in mind that each switch uses store and forward packet switching , what is the total item to move the message from source host to destination host ?
b) Now suppose that the message is segmented into 5000 packets with each packet being 1500 bits long . how long does it take to move the first packet from source host to the first switch ?
When the first packet is being sent from the first switch to the second switch is the second packet is being sent from the source host to the second switch . At what time will the second packet be fully received at the first switch ?

c)How long does it take to move the file from source host to destination host when message segmentation is used ?
compare this result with your answer in part (a)and comment ..