transport layer
Application Layer
The OSI layer that manages end-to-end delivery of data is the Transport Layer, which is the fourth layer of the OSI model. It is responsible for ensuring complete data transfer, error recovery, and flow control between hosts. Protocols such as TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) operate at this layer to provide reliable or fast data delivery, respectively.
data link layer should divide frame into segment by ravi from kurnool
The session layer (layer 5)
Data link layer
A Protocol Data Unit (PDU) is a unit of data specified in a protocol of a given layer of the OSI model. Each layer has its own PDU: at the Application layer, it's called a message; at the Transport layer, it's a segment (or datagram in UDP); at the Network layer, it's a packet; at the Data Link layer, it's a frame; and at the Physical layer, it's a bit or symbol. These PDUs help in managing and encapsulating data as it traverses through the layers of the OSI model.
Layer 2 (Data Link Layer) http://compnetworking.about.com/cs/internetworking/g/bldef_bridge.htm
The OSI layer responsible for establishing, maintaining, and terminating connections with the destination is the Session Layer, which is the fifth layer of the OSI model. It manages sessions between applications, ensuring that data exchange occurs smoothly and efficiently. This layer provides mechanisms for controlling the dialog and synchronization between communication parties.
Data Link Layer
TELNET
Data-Link layer.
Data Link Layer