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Lecture Business data communications and networking (8e): Chapter 5 - Jerry Fitzgerald, Alan Dennis

Chapter 5 - Network and transport layers. In this chapter, the following content will be discussed: Transport & network layer protocols, transport layer functions, network layer functions, TCP/IP examples. | Business Data Communications and Networking 8th Edition Jerry Fitzgerald and Alan Dennis John Wiley & Sons, Inc Prof. M. Ulema Manhattan College Computer Information Systems 5 - Copyright 2005 John Wiley & Sons, Inc Chapter 5 Network and Transport Layers 5 - Copyright 2005 John Wiley & Sons, Inc Outline Transport & Network Layer Protocols TCP/IP, IPX/SPX, X.25, SNA Transport Layer Functions Interacting with Application Layer Packetizing End-to-end delivery of application layer messages Network Layer Functions Addressing Routing TCP/IP Examples 5 - Copyright 2005 John Wiley & Sons, Inc Introduction Transport and Network layers Responsible for moving messages from end-to-end in a network Closely tied together TCP/IP: most commonly used protocol Used in Internet Compatible with a variety of Application Layer protocols as well as with many Data Link Layer protocols Network Layer Data Link Layer Application Layer Transport Layer 5 - Copyright 2005 John Wiley & Sons, . | Business Data Communications and Networking 8th Edition Jerry Fitzgerald and Alan Dennis John Wiley & Sons, Inc Prof. M. Ulema Manhattan College Computer Information Systems 5 - Copyright 2005 John Wiley & Sons, Inc Chapter 5 Network and Transport Layers 5 - Copyright 2005 John Wiley & Sons, Inc Outline Transport & Network Layer Protocols TCP/IP, IPX/SPX, X.25, SNA Transport Layer Functions Interacting with Application Layer Packetizing End-to-end delivery of application layer messages Network Layer Functions Addressing Routing TCP/IP Examples 5 - Copyright 2005 John Wiley & Sons, Inc Introduction Transport and Network layers Responsible for moving messages from end-to-end in a network Closely tied together TCP/IP: most commonly used protocol Used in Internet Compatible with a variety of Application Layer protocols as well as with many Data Link Layer protocols Network Layer Data Link Layer Application Layer Transport Layer 5 - Copyright 2005 John Wiley & Sons, Inc Introduction - Transport layer Responsible for end-to-end delivery of messages Sets up virtual circuits (when needed) Responsible for segmentation and reassembly Breaking the message into several smaller pieces at the sending end Reconstructing the original message into a single whole at the receiving end Interacts with Application Layer Transport Layer Application Layer Network Layer 5 - Copyright 2005 John Wiley & Sons, Inc Introduction – Network Layer Responsible for addressing and routing of messages Selects the best path from computer to computer until the message reaches destination Performs encapsulation on sending end Adds network layer header to message segments Performs decapsulation on receiving end Removes the network layer header at receiving end and passes them up to the transport layer Network Layer Transport Layer Data Link Layer 5 - Copyright 2005 John Wiley & Sons, Inc TCP/IP’s 5-Layer Network Model 5 - Copyright 2005 John Wiley & Sons, Inc .