Скачать или смотреть Sliding Window Protocol in Computer Networks - Role Play Method- Dept.of CSE & CSE (IoT)

#Frames #Noisychannel #Slidingwindow #Netwirklayer #Physicallayer #Datalinklayer #Transmissionmedium #Piggybacking #PAR #ARQ #aceengineeringcollege #aceg


Sliding Window Protocol
Concept:
Sender maintains window of frames it can send
 Needs to buffer them for possible retransmission
 Window advances with next acknowledgements
Receiver maintains window of frames it can receive
 Needs to keep buffer space for arrivals
 Window advances with in-order arrivals

One-Bit Sliding Window
 Each frame is numbered called “Sequence Number”.
 The possible sequence numbers are ‘0’ and ‘1’.
 The size of the window is 1.
 So the sender transmits a frame, waits for its acknowledgment, starts the timer, if acknowledgement comes before timer expires, then transmits the next frame. Otherwise retransmits the same frame.
 Protocols in which the sender waits for a positive acknowledgement before advancing to the next data item is called PAR (Positive Acknowledgement with Retransmission) or ARQ (Automatic Repeat reQuest)
 It uses the concept of stop and wait protocol.
 Transfers data in both directions with stop-and-wait (Piggybacks acks on reverse data frames for efficiency: piggybacking)
• Handles transmission errors, flow control, early timers