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Consider the following method for congestion control in a error-free virtual circuit subnet. A router can only send ACK for a received packet if it knows the packet transmission along the virtual circuit through subsequent routers is successful. Suppose that each router uses stop-and-wait ARQ and provides one buffer (large enough for one packet) for each VC in each direction of traffic. If each router takes T sec to transmit packet (data or ACK) to the next router and there are N routers on the VC, at what rate data packets are delivered to destination host? 

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