Delimiting and Synchronization of Data Exchange in Session Layer

The session layer is responsible for managing and coordinating communication sessions between devices. It ensures that data exchange between devices is synchronized and delimiting is provided to mark the beginning and end of each data block. Let us discuss how delimiting and synchronization of data exchange is provided by the session layer.

Delimiting of Data Exchange

The session layer provides delimiting of data exchange by adding specific characters or codes to mark the beginning and end of each data block. This helps in identifying the boundaries of each data block and ensures that data is transmitted and received correctly. Delimiting can be done using various techniques such as:

1. Start and Stop Characters: The session layer can use specific characters such as STX (start of text) and ETX (end of text) to delimit the data exchange.

2. Length Indicator: The session layer can add a length indicator to the beginning of each data block to specify the length of the data block.

3. Message Identifier: The session layer can use a message identifier to identify the beginning and end of each data block.

Synchronization of Data Exchange

The session layer ensures that data exchange between devices is synchronized by establishing a communication session between them. It uses various techniques to synchronize data exchange such as:

1. Token Passing: In token passing, a token is passed between devices to indicate which device has the right to transmit data.

2. Handshaking: In handshaking, devices exchange control messages to establish a communication session and synchronize data exchange.

3. Synchronization Characters: The session layer can use synchronization characters to ensure that data is transmitted and received correctly. These characters are added to the data stream to maintain synchronization.

Conclusion

In conclusion, the session layer is responsible for managing and coordinating communication sessions between devices. It provides delimiting and synchronization of data exchange to ensure that data is transmitted and received correctly. Delimiting is provided to mark the beginning and end of each data block, while synchronization is provided to establish a communication session between devices and maintain synchronization.