Hey, can you answer these with some explanation, I'm trying to understand not just receive answers, thank you, I will upvote for your efforts!!

Problem 4. (20 points) In the modern packet-switched networks, including the Internet, the source host segments long, application-layer messages (for example, an image or a music file) into smaller packets and sends the packets into the network. The receiver then reassembles the packets back into the original message. We refer to this process as message segmentation. The figure below illustrates the end-to-end transport of a message with and without message segmentation. Consider a message that is 106 bits long that is to be sent from source to destination in the figure. Suppose each link in the figure is 2Mbps. Ignore propagation, queuing, and processing delays. You may want to refer to the simulation at https://wps.pearsoned.com/ecs kurose compnetw 6/216/55463/14198702.cw/index.html a. Consider sending the message from source to destination without message segmentation. How long does it take to move 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 time to move the message from source host to destination host? b. Now suppose that the message is segmented into 1,000 packets, with each packet being 1,000 bits long. How long does it take to move the first packet from source host to the first switch? c. When the first packet is being sent from the first switch to the second switch, the second packet is being sent from the source host to the first switch. At what time will the second packet be fully received at the first switch? d. 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