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ARQ Protocols Prof. Anish Goel
Automatic Repeat Request (ARQ) 2                ARQ Protocols                                                  Anish Goel
Stop-and-Wait ARQ 3                ARQ Protocols                                                  Anish Goel
S&W ARQ - Sequence Numbers 4                ARQ Protocols                                                  Anish Goel
S&W ARQ - Sequence Numbers in ACK 5                ARQ Protocols                                                  Anish Goel
1-Bit Sequence Numbering suffices for Stop-and-Wait ARQ 6                ARQ Protocols                                                  Anish Goel
Stop-and-Wait ARQ 7                ARQ Protocols                                                  Anish Goel
Applications of Stop-and-Wait ARQ 8                ARQ Protocols                                                  Anish Goel
Stop-and-Wait Efficiency 9                ARQ Protocols                                                  Anish Goel
Stop-and-Wait Model 10                ARQ Protocols                                                  Anish Goel
Stop & Wait Efficiency on Error-free channel 11                ARQ Protocols                                                  Anish Goel
Example: Impact of Delay-Bandwidth Product on Transmission Efficiency 12                ARQ Protocols                                                  Anish Goel
Stop and Wait Efficiency in Channel with Errors 13                ARQ Protocols                                                  Anish Goel
Example: Impact of Bit Error Rate on Transmission Efficiency 14                ARQ Protocols                                                  Anish Goel
Go-Back-N (GBN) 15                ARQ Protocols                                                  Anish Goel
Go-Back-N ARQ 16                ARQ Protocols                                                  Anish Goel
S&W timeout and GBN window size long enough to cover round trip time 17                ARQ Protocols                                                  Anish Goel
Go-Back-N with Timeout 18                ARQ Protocols                                                  Anish Goel
Go-Back-N Transmitter & Receiver 19                ARQ Protocols                                                  Anish Goel
Sliding Window Operation 20                ARQ Protocols                                                  Anish Goel
Maximum Allowable Window Size is Ws = 2m-1 21                ARQ Protocols                                                  Anish Goel
ACK Piggybacking in Bidirectional GBN 22                ARQ Protocols                                                  Anish Goel
Required Timeout & Window Size for Bidirectional GBN 23                ARQ Protocols                                                  Anish Goel
Applications of Go-Back-N ARQ 24                ARQ Protocols                                                  Anish Goel
Required Window Size for Delay-Bandwidth 25                ARQ Protocols                                                  Anish Goel
Efficiency of Go-Back-N 26                ARQ Protocols                                                  Anish Goel
Example: Impact of Bit Error Rate on GBN 27                ARQ Protocols                                                  Anish Goel
Selective Repeat ARQ 28                ARQ Protocols                                                  Anish Goel
Selective Repeat ARQ 29                ARQ Protocols                                                  Anish Goel
Selective Repeat ARQ 30                ARQ Protocols                                                  Anish Goel
Send & Receive Windows 31                ARQ Protocols                                                  Anish Goel
What size Ws and Wr allowed? 32                ARQ Protocols                                                  Anish Goel
Ws + Wr = 2m is maximum allowed 33                ARQ Protocols                                                  Anish Goel
Why Ws + Wr = 2m works 34                ARQ Protocols                                                  Anish Goel
Applications of Selective Repeat ARQ 35                ARQ Protocols                                                  Anish Goel
Efficiency of Selective Repeat 36                ARQ Protocols                                                  Anish Goel
Example: Impact of Bit Error Rate on Selective Repeat 37                ARQ Protocols                                                  Anish Goel
Comparison of ARQ Efficiencies 38                ARQ Protocols                                                  Anish Goel
ARQ Efficiencies 39                ARQ Protocols                                                  Anish Goel

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Arq Protocols