LGW2EChapter2figures

LGW2EChapter2figures - Chapter 2 Applications and Layered...

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Chapter 2 Applications and Layered Architectures Chapter Figures
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Leon-Garcia/Widjaja Communication Networks The user clicks on a link to indicate which document is to be retrieved. The browser must determine the Internet address of the machine that contains the document. To do so, the browser sends a query to its local name server. Once the address is known, the browser establishes a connection to the server process in the specified machine, usually a TCP connection. For the connection to be successful, the specified machine must be ready to accept TCP connections. The browser runs a client version of HTTP, which issues a request specifying both the name of the document and the possible document formats it can handle. The machine that contains the requested document runs a server version of HTTP. It reacts to the HTTP request by sending an HTTP response which contains the desired document in the appropriate format. The user may start to view the document. The TCP connection is closed after a certain timeout period. 4. – 6. 1. Step: 2. 3. 7. – 8. Figure 2.1
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Leon-Garcia/Widjaja Communication Networks HTTP client GET STATUS HTTP server Figure 2.2
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Leon-Garcia/Widjaja Communication Networks #, 80 HTTP server HTTP client TCP 80, # Port 80 Ephemeral port # GET STATUS TCP Figure 2.3
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Leon-Garcia/Widjaja Communication Networks Application layer Presentation layer Session layer Transport layer Network layer Data link layer Physical layer Application layer Presentation layer Session layer Transport layer Network layer Data link layer Physical layer Network layer Application A Application B Data Link layer Physical layer Network layer Data Link layer Physical layer Electrical and/or optical signals Communication network Figure 2.4
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Leon-Garcia/Widjaja Communication Networks PS = packet switch H = host H PS H PS PS H H H PS Figure 2.5
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Leon-Garcia/Widjaja Communication Networks G = gateway/ router H = host Net 1 Net 5 Net 3 Net 2 H Net 3 G H H H G G G G G Net 1 Net 2 Net 4 Net 5 Figure 2.6
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Leon-Garcia/Widjaja Communication Networks
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LGW2EChapter2figures - Chapter 2 Applications and Layered...

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