Transport layer accepts data from session layer breaks it into packets and delivers these packets to the network layer. It is the responsibility of transport layer to guarantee successful arrival of data at the destination device. It provides an end-to-end dialog that is the transport layer at the source device directly communicates with transport layer at destination device. Message headers and control messages are used for this purpose. It separates the upper layers from the low level details of data transmission and makes sure an efficient delivery. OSI model provides connection-oriented service at transport layer.
It is responsible for the determination of the type of service that is to be provided to the upper layer. Normally it transmits packets in the same order in which they are sent however it can also facilitate the transmission of isolated messages. There is no surety that these isolated messages are delivered to the destination devices in case of broadcast networks and they will be in the same order as were sent from the source.
If the network layer do not provide adequate services for the data transmission. Data loss due to poor network management is handled by using transport layer. It checks for any packets that are lost or damaged along the way.
It is responsible for the determination of the type of service that is to be provided to the upper layer. Normally it transmits packets in the same order in which they are sent however it can also facilitate the transmission of isolated messages. There is no surety that these isolated messages are delivered to the destination devices in case of broadcast networks and they will be in the same order as were sent from the source.
If the network layer do not provide adequate services for the data transmission. Data loss due to poor network management is handled by using transport layer. It checks for any packets that are lost or damaged along the way.
