Answers
Answer 1
We must compute the time required for data transfer and take the aforementioned constraints into account in order to determine the waiting time for both scenarios in the given network utilising circuit switching and packet switching.
Case: App Store
Circuit switching: In circuit switching, a single link is given exclusive use of the entire bandwidth until the transfer is finished.
a) From S to E, the transmission time is:
Data size = 250MB,
Bandwidth = 100Mbit/s
Transmission time = Data size / Bandwidth
= (250 * 8 * 1024 * 1024) / (100 * 10^6)
= 2048 seconds
W1 = Transmission time = 2048 seconds
W2 = 2 * Transmission time = 2 * 2048 seconds = 4096 seconds
W3 = 3 * Transmission time = 3 * 2048 seconds = 6144 seconds
Transmission time from S to E for each packet:
Given: Data size = 250MB = 250 * 8 * 1024 * 1024 bits
Packet size = 10KB = 10 * 8 * 1024 bits
Number of packets = Data size / Packet size
= (250 * 8 * 1024 * 1024) / (10 * 8 * 1024)
= 32,768 packets
Transmission time for each packet = Packet size / Bandwidth
= (10 * 8 * 1024) / (100 * 10^6)
= 0.008192 seconds
Thus, this can be concluded regarding the given scenario.
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