THE TRANSPORT LAYER Scott Garland COSC 352.

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Presentation transcript:

THE TRANSPORT LAYER Scott Garland COSC 352

WHAT IS IT? Under the TCP/IP Model Under the OSI Model 2ND highest layer in the TCP/IP model. Responds to service requests from the Application Layer Issues requests to the Internet Layer Under the OSI Model 4th layer of the OSI Model Responds to service requests from the Session Layer Issues service requests to the Network Layer

OVERALL FUNCTIONS RECALL UPPER LEVEL LAYER FUNCTIONS** TRANSPORT LAYER FUNCTIONS** Doesn’t care about the “nuts and bolts” Acts as a liaison Enables communication between software applications on different computers. Makes sure many different applications can all send and receive data.

Transfer protocol Typical protocols within Transport Layer TCP (Transmission Control Protocol): provides reliable, in-order delivery of a stream of bytes.** UDP (User Diagram Protocol): programs on networked computers can send short messages known as datagrams (packets) to one another.** DCCP (Datagram Congestion Control Protocol: works with timing constraints on the delivery and reliable in-order delivery.** SCTP (Stream Control Transmission Protocol): conserves message boundaries by operating on whole messages instead of single bytes.**

SERVICES UNDER TCP/IP MODEL Same Order Delivery Connection-Oriented Reliable Data Flow Control Congestion Avoidance Byte Orientation Ports

SERVICES UNDER OSI MODEL Flow Control/Connection-Oriented Segmentation/Desegmentation Error Control

Citations http://www.rigacci.org/docs/biblio/online/i ntro_to_networking/c4412.htm www.freecomputerbooks.com Guide to Networking Essentials, Greg Tomsho