6. In a local-area network, sites may want to transmit data over a link simultaneously. If nothing is done, this will cause serious collision. CSMA/CD and token passing are two popular techniques developed to avoid the aforementioned collision. Please explain how CSMA/CD and token passing operate.

4. In a multimedia system, SCAN-EDF is a popular disk scheduling scheme. Suppose that you have the following file requests (request, deadline, cylinder): (A, 150, 25), (B, 201, 112), (C, 399,95), (D,94, 31), (E, 295, 185), (F, 78,85), (G, 165, 150), (H, 125, 101), (I, 300,85), (J, 210, 90). Considering that the disk head is currently on cylinder 49 and moving toward cylinder 50, please show how the disk head moves to satisfy all requests using SCAN-EDF.

6. In a local-area network, sites may want to transmit data over a link simultaneously. If nothing is done, this will cause serious collision. CSMA/CD and token passing are two popular techniques developed to avoid the aforementioned collision. Please explain how CSMA/CD and token passing operate.

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