Question 1:
For each of the following functions identify the corresponding layer from OSI model.

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a. Communicates directly with user’s application program
b. Error correction and retransmission.
c. Mechanical, electrical, and functional interface
d. Responsibility for delivery between adjacent nodes
e. Reassembly of data packets

Question 2:
If we have three systems as follows:
1. One in communication from outside city
2. Two systems are within the same city but at different offices not far apart