Sliding window protocol | Types of sliding window protocol | 1 Bit | Go-Back-N ARQ |Selective Repeat

Summary

The video script explains the Sliding Window protocol, an improvement over the Stop and Wait protocol for data transmission. It allows the sender to transmit multiple frames without waiting for an acknowledgment for each, thus enhancing efficiency. The script uses an example of sending 10 frames with a window size of four, illustrating how the window advances as acknowledgments are received. It also mentions three types of Sliding Window protocols: One-bit, Go-Back-N, and Selective Repeat.

Takeaways

• 🚩 The sliding window protocol is designed to overcome the limitations of the stop and wait protocol.
• 🔄 In stop and wait, the sender must wait for an acknowledgment after sending each frame, which can be inefficient for large volumes of data.
• 📚 The sliding window protocol allows the sender to send multiple frames without waiting for an acknowledgment for each one.
• 🖼️ The window size in the protocol is a key parameter, defining how many frames can be sent without waiting for acknowledgments.
• 💡 The example given is a window size of four, meaning the sender can send four frames before needing to wait for an acknowledgment.
• 🔀 The window slides as acknowledgments are received, allowing the sender to send more frames.
• 📨 The sender maintains a window of frames that are awaiting acknowledgment.
• 📢 The receiver sends acknowledgments for the frames it successfully receives.
• 🔁 The protocol continues with the sender sending frames and the window sliding as acknowledgments are received.
• 📊 There are three types of sliding window protocols: one-bit sliding window protocol, go-back-n ARQ protocol, and selective repeat protocol.
• 🔗 Links to videos explaining these three types of sliding window protocols will be provided in the comments or description.

Q & A

What is the main purpose of the sliding window protocol?

The sliding window protocol is mainly used to overcome the limitations of the stop and wait protocol by allowing multiple frames to be sent without waiting for an acknowledgement for each frame.

What is the major problem with the stop and wait protocol?

The major problem with the stop and wait protocol is that the sender can only send one frame at a time and must wait for an acknowledgement before sending the next frame, which leads to inefficiency when sending multiple frames.

How does the sliding window protocol improve upon the stop and wait protocol?

The sliding window protocol allows the sender to send multiple frames to the receiver without waiting for individual acknowledgements, improving efficiency when sending a large number of frames.

What is the role of the window size in the sliding window protocol?

The window size determines the number of frames the sender can send to the receiver without waiting for an acknowledgement. It defines how many frames can be in transit at any given time.

In the example provided, what is the window size and how does it work?

In the example, the window size is 4. This means the sender can send 4 frames (0 to 3) to the receiver without waiting for acknowledgements. As acknowledgements are received, the window slides, allowing the sender to send additional frames.

What happens when the receiver acknowledges a frame in the sliding window protocol?

When the receiver acknowledges a frame, the sender is informed that the frame was successfully received. The sender can then send the next frame in sequence, and the sliding window moves forward by one position.

What are the three types of sliding window protocols mentioned?

The three types of sliding window protocols mentioned are the One-bit sliding window protocol, Go-Back-N ARQ protocol, and Selective Repeat protocol.

How does the sliding window protocol handle lost or delayed frames?

While not detailed in the script, the sliding window protocol typically uses acknowledgements and timeouts to handle lost or delayed frames. If an acknowledgement is not received within a certain time, the sender may resend the frame.

Why is the sliding window protocol more efficient for transmitting multiple frames?

The sliding window protocol is more efficient because it allows multiple frames to be in transit simultaneously, reducing the idle time of the sender and making better use of the available bandwidth.

What does the sender do when all frames within the window have been sent?

When all frames within the window have been sent, the sender waits for acknowledgements from the receiver. As acknowledgements are received, the window slides forward, allowing the sender to transmit additional frames.