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(d) (6 pt.) The Ethernet (CSMA/CD) alternates between contention intervals and successful transmissions. Assume a 100 Mbps Ethernet over 1 km cable with signal

(d) (6 pt.) The Ethernet (CSMA/CD) alternates between contention intervals and successful transmissions. Assume a 100 Mbps Ethernet over 1 km cable with signal speed of 200,000 km/sec. What is the worst-case collision detection time? If the average number of contention slots before a successful transmission is 4, then what should be the average frame size to achieve an efficiency of 50%.

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