A. The device shown is a hub and hubs place all ports in the same broadcast domain and the same collision domain.
B. The contents of a protocol data unit (PDU) depend on the PDU as they are created in a specific order and their contents are based on that order. A packet will contain IP addresses but not MAC addresses as MAC addresses are not present until the PDU becomes a frame.
C. You should select a router to connect the two groups. When computers are in different subnets, as these two groups are, you will require ...
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