It is used to notify the peer of any error condition that has occurred. Alert: This sub-protocol defines the alert levels and provides a description of the alerts.The higher layer consists of the following sub-protocols:.Transmitting the data from the upper application layer to the lower transport layer and vice versa.Applying the Message Authentication Code (MAC), a hash to maintain the data integrity.Compressing/decompressing the outgoing/incoming data.Fragmenting the message to be transmitted into manageable blocks.TCP Record Protocol Layer – This is the lower layer which lies on top of the TCP layer and is responsible for:.It is designed to work on top of a reliable transport protocol such as TCP (but has been adapted to UDP, as well) and is divided into two sub-layers: TLS lies in between the application and the transport layer.
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