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Delayed Acknowledgments is a medium quant interview question on networking.
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This is a medium-difficulty networking question that tests your understanding of flow control and efficiency trade-offs in TCP. It appears in interviews at firms that build trading infrastructure, market-data systems, or other latency-sensitive applications where knowledge of protocol behaviour is critical to diagnosing performance issues.
The question asks you to explain the reasoning behind a specific TCP optimisation—one that affects how the protocol handles the return path. Rather than requiring calculation or code, it probes whether you understand the design decisions embedded in the TCP/IP stack and can articulate the problem that this mechanism solves.