Cisco 100-105 Exam

What is the purpose of flow control?

  • A. To ensure data is retransmitted if an acknowledgement is not received.
  • B. To reassemble segments in the correct order at the destination device.
  • C. To provide a means for the receiver to govern the amount of data sent by the sender.
  • D. To regulate the size of each segment.
Answer: Option C.
Flow control is the management of data flow between computers or devices or between nodes in a network so that the data can be handled at an efficient pace.
Too much data arriving before a device can handle it causes data overflow, meaning the data is either lost or must be retransmitted. For serial data transmission locally or in a network, the Xon/Xoff protocol can be used. For modem connections, either Xon/Xoff or CTS/RTS (Clear to Send/Ready to Send) commands can be used to control data flow. In a network, flow control can also be applied by refusing additional device connections until the flow of traffic has subsided.

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