Solution

Concept:

The maximum achievable throughput is determined by the number of packets that can be transmitted over the link in a given amount of time. This is limited by the size of the sender window, the round-trip time (RTT), and the packet size.

Explanation:

In this case, the maximum achievable throughput can be calculated as the product of the sender window size, the packet size, and the number of packets that can be transmitted in one RTT.

Since we have already determined the maximum sender window size to be 54, the packet size is 64 bytes or 512 bits, and the RTT is calculated as

2 × propagation delay = 2 × 6 μs/km × 3000 km = 36000 μs.

So, the maximum achievable throughput can be calculated as:

54 × 512 bits / (RTT in seconds) = 54 × 512 bits / (36000 × 10^-6) = (54 × 512) / 36 = 672 Mbps = 0.672 Gbps