In the UDP protocol, flow control regulates the amount of data that application can send into the network, helping to prevent buffer overflow at the receiver side.单项选择题
A
True
B
False

Question

In the UDP protocol, flow control regulates the amount of data that application can send into the network, helping to prevent buffer overflow at the receiver side.

BlackTom AI · Accepted Answer

UDP is a connectionless transport protocol that provides minimal services (port addressing, checksums, length) and does not implement mechanisms like acknowledgements, windowing, or sequence numbers. These mechanisms are the building blocks of flow control in reliable transports.

1) Relevant knowledge points:
- Flow control: a transport-layer mechanism that regulates how much data a sender can transmit so the receiver’s buffers are not overwhelmed (typically implemented via window advertisement and ACKs).
- UDP characteristics: connectionless, no ACKs, no sequence numbers, no windowing, no built-in flow control; packet loss or receiver buffer overflow simply causes datagrams to be dropped.
- TCP contrasts: TCP implements flow control (advertised window) and congestion control; TCP prevents receiver-side buffer overflow by limiting sender transmission based on receiver feedback.

2) Step-by-step reasoning:
- UDP lacks feedback: there are no acknowledgements or advertised receive windows from the receiver to the sender.
- Without feedback, the sender cannot learn the receiver’s available buffer space and therefore cannot throttle its sending rate to prevent overflow.
- If the receiving application or OS receive buffer is full, incoming UDP datagrams are dropped; UDP itself does nothing to prevent this.
- Any prevention of receiver buffer overflow when using UDP must be implemented at the application layer (e.g., application-level acknowledgements, rate limiting, or RTP/RTCP mechanisms), not by UDP itself.

3) (No numerical calculations apply.)

4) Why the correct answer is correct:
The statement claims UDP provides flow control to regulate application sending and prevent receiver buffer overflow. Because UDP lacks the transport-layer mechanisms required for flow control, that claim is false.

5) Why the other option is incorrect:
- “True” would imply UDP contains built-in flow control like TCP, which it does not; thus “True” is incorrect.

Conclusion: The correct answer is False, which matches the provided answer.

In the UDP protocol, flow control regulates the amount of data that application can send into the network, helping to prevent buffer overflow at the receiver side.单项选择题

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