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3. Re-examine case #2 with the following data:
P = 0.001 error rate of a frame (probability of frame error)
Cf = 10 cost of transmitting a frame (without error checking)
Ef = 1.2 cost of error checking a frame at the Data Link Layer.
Packet size 10 frames/packet
Cp = 100 cost of transmitting a packet (without error checking)
Ep = 10 cost of error checking a packet at TCP Layer.
a) What is the average cost of sending a packet if it does error checking at the Data Link Layer?
b) What is the average cost of sending a packet if it does error checking at the Network Layer?
c) In this case, where do you think the error checking should be done?

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