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ccna 200 301 bookstore movers md.The SessionLayer is responsible for establishing, managing, and tearing down sessions between representation layer communication pairs, and it also provides session control functions between devices or nodes. It coordinates communication between systems and services, and manages communication through three different modes: Simplex, W-T (HalfDuplex) and FullDuplex. In a nutshell, the basic role of the session layer is to distinguish the data of different applications from the data of other applications.2.3.4 Transport LayerThe Transport Layer segments and reassembles data into a data stream. The Transport Layer provides services that segment and reassemble data from higher-level applications and place that data into the same data stream. They provide an end-to-end data transfer service and create a logical connection between the sending and destination hosts in an interconnected network.Some of you may already be familiar with TCP and UDP (it doesn't matter if you're not - I'll cover them in detail in Chapter 4). You'll know that both protocols work at the transport layer, and that TCP provides a reliable service and UDP provides an unreliable service. That means that application developers have more options when it comes to working with TCP/IP protocols, and they can choose between the two.The transport layer provides mechanisms to multiplex higher layer applications, establish sessions, and tear down virtual lines. It also hides all network-related information details from higher layers, thus providing transparent transport.The term Reliable Networking can be used for the transport layer. This term implies that acknowledgement, sequencing, and flow control mechanisms are used in this protocol.The transport layer can be either connectionless or connection-oriented. However, Cisco would prefer that you understand the connection-oriented part of the transport layer. The next vignette broadly describes the connection-oriented (and reliable) protocols in the transport layer.Data integrity is guaranteed by the transport layer, which maintains FlowControl and allows reliable data transfer protocols to be used for application requests between systems. FlowControl prevents the sending host on one end of the connection from overflowing the receiving host's receive cache - a situation that would result in lost data. Reliable data transfer relies on a connection-oriented approach to communication between systems and is achieved through various protocols.. The receiver will acknowledge the sender upon receipt of a slice.All unacknowledged slices will be retransmitted.