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Module 4: Transport Layer & Congestion Control

20162m

Which one of the following statements is FALSE?
(i) TCP guarantees a minimum communication rate
(ii) TCP ensures in-order delivery
(iii) TCP reacts to congestion by reducing sender window size
(iv) TCP employs retransmission to compensate for packet loss

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Answer: (i) TCP guarantees a minimum communication rate

Why: TCP provides reliable, in-order, congestion-controlled byte-stream delivery, but it never reserves bandwidth or guarantees any minimum data rate — the achievable rate depends on network conditions and the congestion window. Options (ii), (iii) and (iv) are all standard TCP services (in-order delivery via sequence numbers, window reduction on congestion, and retransmission on loss).

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