Explain stop and wait and sliding window protocol ques10
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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. To keep track of the frames that have been acknowledged, each ACK has a sequence number.
The receiver acknowledges a frame by sending an ACK that includes the Sequence number of the next expected frame.
The sender sends the next n frames starting with the last received sequence number that has been transmitted by the receiver (ACK). Hence, a single ACK can acknowledge multiple frames as shown in the Fig.
The receiver receives frames 1, 2 and 3. Once frame 3 arrives ACK4 is sent to the sender. This ACK4 acknowledge the receipt of frame 1, 2 and 3 and informs the sender that the next expected frame is frame 4. Therefore, the sender can send multiple back-to-back frames, making efficient use of the channel.
The range of sequence number uses modul0-2 arithmetic. To keep track of the frames that have been acknowledged, each ACK has a sequence number.
The receiver acknowledges a frame by sending an ACK that includes the Sequence number of the next expected frame.
The sender sends the next n frames starting with the last received sequence number that has been transmitted by the receiver (ACK). Hence, a single ACK can acknowledge multiple frames as shown in the Fig.
The receiver receives frames 1, 2 and 3. Once frame 3 arrives ACK4 is sent to the sender. This ACK4 acknowledge the receipt of frame 1, 2 and 3 and informs the sender that the next expected frame is frame 4. Therefore, the sender can send multiple back-to-back frames, making efficient use of the channel.
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