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CSMA/CD

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A 2-km-long, 10-Mbps CSMA/CD LAN (not 802.3) has a propagation speed of 200 m/microsec.  
Repeaters are not allowed in this system. Data frames are 512 bits long, including 32 bits of header, checksum, and other overhead.
The first bit slot after a successful transmission is reserved for the receiver to capture the channel in order to send a 32-bit acknowledgement frame.
The effective data rate is _____________________ Mbps (correct to 2 decimal places), excluding overhead, assuming that there are no collisions?
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