1. The University of Adelaide, School of Computer Science
14 January 2019
Computer Networks, 5th Edition
Chapter 9
Applications
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Chapter 2 — Instructions: Language of the Computer

2. FIGURE 9.1 Sequence of mail gateways store and forward email messages.
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FIGURE 9.2 IMAP state transition diagram.
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FIGURE 9.3 The Firefox web browser.
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FIGURE 9.4 HTTP 1.0 behavior.
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FIGURE 9.5 HTTP 1.1 behavior with persistent connections.
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FIGURE 9.6 SOAP message structure.
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FIGURE 9.7 A session directory tool displays information extracted from SDP messages.
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9. FIGURE 9.8 Establishing communication through SIP proxies.
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FIGURE 9.9 Message flow for a basic SIP session.
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FIGURE 9.10 Devices in an H.323 network.
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FIGURE 9.11 Differentiated Services applied to a VOIP application. DiffServ queueing is applied only on the upstream link from customer router to ISP.
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FIGURE 9.12 Admission control using session control protocol.
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FIGURE 9.13 Co-ordination of SIP signalling and resource reservation.
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FIGURE 9.14 Names translated into addresses, where the numbers 1 to 5 show the sequence of steps in the process.
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FIGURE 9.15 Example of a domain hierarchy.
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FIGURE 9.16 Domain hierarchy partitioned into zones.
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FIGURE 9.17 Hierarchy of name servers.
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FIGURE 9.18 Name resolution in practice, where the numbers 1 to 10 show the sequence of steps in the process.
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FIGURE 9.19 Overlay network layered on top of a physical network.
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FIGURE 9.20 Overlay nodes tunnel through physical nodes.
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FIGURE 9.21 Alternative multicast trees mapped onto a physical topology.
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FIGURE 9.22 Multicast tree embedded in an overlay mesh.
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FIGURE 9.23 The triangle inequality does not necessarily hold in networks.
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FIGURE 9.24 Example topology of a Gnutella peer-to-peer network.
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FIGURE 9.25 Both nodes and objects map (hash) onto the ID space, where objects are maintained at the nearest node in this space.
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FIGURE 9.26 Objects are located by routing through the peer-to-peer overlay network.
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FIGURE 9.27 Example routing table at the node with ID 65a 1 f cx.
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FIGURE 9.28 Adding a node to the network.
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FIGURE 9.29 Peers in a BitTorrent swarm download from other peers that may not yet have the complete file.
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FIGURE 9.30 Components in a Content Distribution Network (CDN).
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