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TCP Service Model is a cooked quant interview question on networking.
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This question tests your grasp of the fundamental properties and guarantees that TCP provides to applications. It appears in networking rounds at firms that build or operate low-latency trading systems, market data infrastructure, or other performance-sensitive services where engineers must choose between TCP, UDP, and other transport protocols.
To answer correctly, you need to be familiar with TCP's core commitments: ordered delivery, reliability through retransmission, congestion control, and connection-oriented semantics. The question rewards candidates who can distinguish TCP's actual service model from common misconceptions or oversimplifications, and who understand why these guarantees matter for system design.