Layered Architecture

Prof. Anish Goel

Layers, Services & Protocols

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Protocols

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Layers

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Web Browsing Application

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Events 1 to part of 2 in Table 2.1 (DetermineInternet Address)

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Part of Event 2 in Table 2.1 (Establish a TCP connection)

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Events 3 to 8 in Table2.1

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HTTP (HyperText Transfer Protocol)

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HTTP Protocol

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TCP

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HTTP uses service of TCP

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DNS Protocol

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DNS Servers

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Example: UDP

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Summary

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Why Layering?

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Open Systems Interconnection

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OSI Reference Model

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7-Layer OSI Reference Model

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Physical Layer

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Data Link Layer

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Network Layer

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Internetworking

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Transport Layer

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Application & Upper Layers

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Headers & Trailers

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OSI Unified View: Protocols

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OSI Unified View: Services

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Layers, Services & Protocols

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Connectionless & Connection-OrientedServices

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Why Internetworking?

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Why Internetworking?

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Internet Protocol Approach

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Internet Names & Addresses

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Physical Addresses

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Example internet

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Ethernet Encapsulation

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IP packet from workstation to server

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IP packet from server to PC

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How the layers work together

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Encapsulation

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Summary

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