Protocols of noiseless

Protocol for Noiseless
> Simplest protocol
> Stop and Wait Protocol

1. PRESENTERS: SHIEKH ALI ZAIN (2017-CS-052) MOHTASHIM SIDDIQUI(2017-CS-048) ALINA NAEEM(2017-CS-044)

2. Protocols Of Noiseless SIR SYED UNIVERSITY OF ENGINEERING & TECHNOLOGY

3. “What  we know  is a drop, what  we  don't  know  is an ocean”  ISAAC NEWTON

4. TODAY’S DISCUSSION INTRODUCTION SIMPLEST PROTOCOL STOP & WAIT PROTOCOL ADVANTAGES DISADVANTAGES CONCLUSION

5. PROTOCOLS FOR NOISELESS CHANNELS SIMPLEST STOP & WAIT

6. WHAT IS A PROTOCOL? The set of rules and regulations is called a Protocol. That provide smooth and reliable transmission of frames between nodes In networking, a frame is a unit of data. Frames also help to determine how data receivers interpret a stream of data from a source. Nodes are devices or data points on a larger network.

7. WHAT ARE NOISELESS(error-free) CHANNELS Noiseless channels are the ideal channel in which no frames are lost, duplicated, or corrupted. We will introduce two protocols for this type of channel: The first is a protocol that does not use flow control (Simplest Protocol) the second is the one that does (Stop-and-Wait Protocol).

8. SIMPLEST PROTOCOL It is a unidirectional protocol in which data frames are traveling in only one direction from the sender to receiver. The receiver can immediately handle any frame it receives with a processing time that is small enough to be negligible. The sender sends a sequence of frames without even thinking about the receiver. To send three frames, three events occur at the sender site and three events at the receiver site. flow diagram of Simplest protocol

9. STOP & WAIT PROTOCOL The sender sends one frame, stops until it receives agreement the receiver (okay to go ahead), and then sends the next frame. We still have unidirectional communication for data frames, but auxiliary ACK frames (simple tokens of acknowledgment) travel from the other direction. We add flow control (ACK) to our previous protocol.

10. The sender sends one frame and waits for feedback from the receiver. When the ACK arrives, the sender sends the next frame. Note that sending two frames in the protocol involves the sender in four events and the receiver in two events. Flow diagram of stop & wait protocol

11. Simplest Protocol

12. Simplest Protocol Stop-and-Wait Protocol

13. ADVANTAGES SIMPLEST PROTOCOL: The transmitting (Tx) and receiving (Rx) hosts are always ready  Works well for small frames. STOP & WAIT PROTOCOL: To improve the efficiency of transmission, multiple frames must be in transition while waiting for acknowledgment.  Works well for large frames.

14. DISADVANTAGES SIMPLEST PROTOCOL: Not appropriate for large data . STOP & WAIT PROTOCOL: Frames may be either damaged or lost completely. If ACK damaged, transmitter will not recognize it.

15. CONCLUSION Network is responsible for transmission of data from one device to another device. The end to end transfer of data from a transmitting application to a receiving application involves many steps, each subject to error. With the error control process, we can be confident that the transmitted and received data are identical. Data can be corrupted during transmission. For reliable communication, error must be detected and corrected.