An illustration of a sliding window in (a) initial, (b) intermediate, and (c) final positions.

• Sliding window can increase throughput dramatically.

• To understand why, compare the sequence of transmissions with a stop-and-go scheme and a sliding window scheme. Figure contains a comparison for a 4-packet transmission.

Comparison of …

• In this flow control method, the receiver allocates buffer space for n frames in advance and allows transmission of multiple frames. This method allows the sender to transmit n frames without an ACK. A k-bit sequence number is assigned to each frame.
• The range of sequence number uses modul0-2 arithmetic. …