Computer Networking
What is the purpose of flow control?

To provide a means for the receiver to govern the amount of data sent by the sender.
To reassemble segments in the correct order at the destination device.
To regulate the size of each segment.
To ensure that data is retransmitted if an acknowledgment is not received.

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Computer Networking
X.21 is

None of these
network access standard for connecting stations to a circuit-switched network
a method access control technique for multiple-access transmission media
a method of determining which device has access to the transmission medium at any time
a very common bit-oriented data link protocol issued by ISO

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