Which one of the following statements is FALSE?
(A) TCP guarantees a minimum communication rate
(B) TCP ensures in-order delivery
(C) TCP reacts to congestion by reducing sender window size
(D) TCP employs retransmission to compensate for packet loss
Answer: (A)
Explanation: Transport Layer protocols offer certain services to the applications using them. These services include-
- Reliable data transfer.
- Throughput
- Timing
- Security
Out of these, TCP only provides Reliable Data Transfer, which means data from one end reaches the other end error-free and in-order.
To provide a reliable service,
- It ensures in-order delivery of packets by numbering them.
- It avoids congestion by limiting the sending window size.
- It retransmits packets which are lost in the path.
But TCP does not provide a fixed throughput as a service. Hence option (A), TCP ensures a minimum communication rate, is false.
Therefore option (A) is correct.
This explanation is provided by Chirag Manwani.
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