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ccna 200 301 bookstore movers alexandria.J|Sender send send 2 Window size is 1 Receiver I .......................... I ...... receive [ V .......... I ''II: II - I "I I Acknowledge 2 I " - -------------------------- Receive 2V -. I - " I acknowledge 3Send 2Send 3Confirm 4 Send 4Figure 2.11 Sliding windowIn this simplified mini-case, both the sender device and the receiver device are workstations. In a realistic environment, the unit of measure used would not be a simple count, but the number of bytes that can be sent.If the receiving host does not receive all the bytes it is supposed to receive, this host can improve the efficiency of the communication session by reducing the window size. Acknowledgement MechanismA reliable data transfer mechanism ensures the integrity of the data stream as it travels from one device to another over a properly functioning data link. It ensures that the data stream is not duplicated and is not lost. This is done through an active acknowledgment mechanism card with retransmission capabilities. This mechanism, guaranteed by the lata Ne AcknowledgmentWithRetransmission), requires the receiver device to send an acknowledgment message to the sender device when it receives data. The sender device keeps track of the number of bytes in each data segment. After sending enough bytes for a data segment, it waits for an acknowledgement message, which it receives before continuing to send the next round of bytes. When the sender device sends a data segment, it opens a timer and retransmits the data segment if it does not receive an acknowledgement message from the receiver for the data segment before this timer times out.