In the TCP/IP model, the transport layer is responsible for reliability and flow control from
source to the destination. TCP provides the mechanism for flow control by allowing the
sending and receiving hosts to communicate. A flow control mechanism avoids the problem
with a transmitting host overflowing the buffers in the receiving host.

Which of the following flow control mechanism guarantees reliable delivery of data?

A.
Sliding Windows

B.
Windowing

C.
Positive Acknowledgment with Retransmission (PAR)

D.
Synchronization

Explanation:

Reference:
http://condor.depaul.edu/jkristof/technotes/tcp.html(1.1.3 Reliability)