The go-back-n protocol is a reliable data link layer protocol used for error control in data transmission, leveraging a sliding window mechanism for managing packets. It allows the sender to transmit multiple frames before receiving an acknowledgment, but requires retransmission of all subsequent frames if an error occurs. Widely applicable in scenarios with potential frame loss like TCP and wireless communications, go-back-n balances efficiency and resource usage by adjusting window size.

1. A Protocol Using Go-Back-N
Presented By:-
S. Bhuvan Sai
227R1A73C0

2. Introduction to Go-Back-N Protocol
• The Go-Back-N protocol is a reliable data link layer protocol used
for error control in data transmission.
• It belongs to the Automatic Repeat reQuest (ARQ) family of
protocols.
• Go-Back-N is particularly useful in environments with high error
rates, ensuring data integrity during transmission.

3. Key Concepts of Go-Back-N
• The protocol employs a sliding window mechanism to manage
the flow of packets.
• It allows the sender to transmit multiple frames before needing
an acknowledgment for the first one.
• The sender must keep track of unacknowledged frames, which
is crucial for the retransmission process.

4. Window Size and Its Importance
• The window size in Go-Back-N determines how many frames can
be sent before waiting for an acknowledgment.
• A larger window size improves throughput but requires more
buffer space at the sender and receiver.
• Careful consideration of the window size is essential to balance
efficiency and resource usage.

5. Sending and Acknowledgment Process
• The sender transmits frames continuously until the window limit
is reached.
• Upon receiving frames, the receiver sends an acknowledgment
for the last correctly received frame.
• If a frame is lost or corrupted, the sender must go back and
retransmit that frame and all subsequent frames.

6. Error Handling in Go-Back-N
• The protocol's main challenge is managing errors and ensuring
data consistency.
• If a frame is detected as erroneous, it triggers the sender to
retransmit all subsequent frames.
• This approach can lead to inefficiencies, particularly in high-
error environments, but maintains reliability.

7. Advantages of Go-Back-N
• Go-Back-N is simple to implement and understand, making it a
popular choice in various applications.
• It provides a reliable means of data transmission while
managing network congestion efficiently.
• The protocol also allows for a smooth flow of data, as multiple
frames can be in transit simultaneously.

8. Applications of Go-Back-N Protocol
• Go-Back-N is commonly used in network protocols, such as TCP
and wireless communications.
• It is suitable for scenarios where the loss of frames is possible,
like satellite communications.
• The protocol can also be found in file transfer applications,
ensuring complete and accurate data delivery.
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• This presentation outlines the key aspects of the Go-Back-N
protocol, providing a comprehensive overview suitable for

9. Thank You