Lecture6_2up

Lecture6_2up - ECE-547 Introduction to Computer...

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1 Purdue University ECE ECE -547 547 Introduction to Computer Introduction to Computer Communication Networks Communication Networks Instructor: Instructor: Xiaojun Xiaojun Lin Lin Lecture 6 Lecture 6 Purdue University Transport Layer Transport Layer ¾ Provides two basic types of service ¾ TCP for reliable connection-oriented transfer of byte streams ¾ UDP (User Datagram Protocol) which consists of best effort connectionless transfer of individual messages Î provides no mechanism for flow control or error recovery. ¾ Question: What would UDP be useful for?
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2 Purdue University Application Layer Application Layer ¾ Provides services that can be used by other applications. ¾ For example, services have been provided for rlogin , email , ftp , http , etc. ¾ The Application layer incorporates the functions of the top three OSI layers (Application, Presentation, and Session) ¾ Application layer programs are meant to run directly over the Transport Layer Purdue University TCP/IP Network Architecture TCP/IP Network Architecture Application Layer Transport Layer Internet Layer Network Interface Application Layer Transport Layer Internet Layer Network Interface (a) (b) ¾ TCP/IP does not require strict layering ¾ For example, the application layer has the option of bypassing intermediate layers, so an application could run directly over the Internet layer.
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3 Purdue University Flow of Information Flow of Information Application Transport Internet Network Interface Application Transport Internet Network Interface Internet Network Interface Network 1 Network 2 Machine A Machine B Router/Gateway Purdue University Example Protocols of TCP/IP Suite Example Protocols of TCP/IP Suite HTTP SMTP RTP TCP UDP IP Network Interface 1 Network Interface 3 Network Interface 2 DNS
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4 Purdue University Thus Far Thus Far ¾ History of Communication Networks (Telephone and Data networks) ¾ Packet and Circuit Switching ¾ Future of networking ¾ Open and ongoing problems ¾ Layered Networking Architecture (OSI and Internet architectures) Purdue University Network Design and Network Design and Queueing Queueing ± To design a network, we need quantitative results
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Lecture6_2up - ECE-547 Introduction to Computer...

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