a Problem #2 (06 points) In modern packet-switched networks, the source host segments long, application-layer messages (

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A Problem 2 06 Points In Modern Packet Switched Networks The Source Host Segments Long Application Layer Messages 1 (189.57 KiB) Viewed 47 times

a Problem #2 (06 points) In modern packet-switched networks, 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 figure below illustrates a switched network. Consider a message that is 7.5 *106 bits long to be sent from the source to the destination. (Assume header size is negligible relative to the entire message size). Suppose each link is 1.5 Mbps. Focus on transmission delays only and assume all other delay components are negligible. (a) [3 points] Consider sending the message from source to the destination without message segmentation. How long does it take to move the message from the source host to the first packet switch? Keep in mind that each switch uses store-and-forward packet switching. What is the total time to move the message from source to the destination host? (b) [3 points] 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 to the first switch? 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? Source Packet switch Packet switch Destination