How might high latency affect data transfer in traditional TCP?

• A. It would increase the reliability of data transfer
• B. It could lead to increased timeout and retransmission rates
• C. It would have no effect on data transfer
• D. It would speed up the connection process

Answer: (B)

High latency can significantly impact data transfer in traditional TCP (Transmission Control Protocol) by leading to increased timeout and retransmission rates. When latency is high, the time it takes for data packets to travel across the network from the sender to the receiver increases. TCP operates on the principle of acknowledgment, where the sender waits for an acknowledgment from the receiver after successfully sending a packet before sending the next one.

If the latency is high, the sender may not receive acknowledgments in a timely manner, resulting in the sender assuming that the packets have been lost or damaged. Consequently, this can trigger a timeout in TCP, which leads to retransmission of the packets. Thus, the overall efficiency of the data transfer is reduced, as more time is spent on waiting and retransmitting data rather than successfully sending new packets.

This response identifies the core issue with high latency in a TCP context; it highlights how latency delays acknowledgments and can cause back-and-forth communication delays, which directly affects the throughput and efficiency of the connection.