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# GATE | GATE-CS-2003 | Question 84

• Last Updated : 05 Nov, 2020

Host A is sending data to host B over a full duplex link. A and B are using the sliding window protocol for flow control. The send and receive window sizes are 5 packets each. Data packets (sent only from A to B) are all 1000 bytes long and the transmission time for such a packet is 50 µs. Acknowledgement packets (sent only from B to A) are very small and require negligible transmission time. The propagation delay over the link is 200 us. What is the maximum achievable throughput in this communication?
(A) 7.69 × 106 bytes per second
(B) 11.11 × 106 bytes per second
(C) 12.33 × 106 bytes per second
(D) 15.00 × 106 bytes per second

Explanation: Network throughput,

`≈ Window size / roundtrip time `

Roundtrip time,

```= 2 × Packet delivery time + processing delay
= Transmission delay + 2 * propagation delay
= 50 microsec + 2 * 200 microsec
= 450 microsec ```

Now, Throughput

```= ((5*1000*bytes)/450microsec)
= 11.1111 * 106 bytes per second ```

So, option (B) is correct.

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