Chapter 9 differs from Chapter 8 in the following regards:
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Scale
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Complexity
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Multi-hop Communication
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Very large number of possible communication endpoints
The important concepts are:
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New Kinds of Problems
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Addressing
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Delivery (routing)
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Order preservation
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New Layers
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Network (delivery between host machines, IP)
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Transport (delivery between processes, e.g. mail reader
and mail server, TCP, UDP)
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New Distinctions
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Connection-Oriented Communication (like telephone service)
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Connectionless Communication (like postal service)
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Local- and Wide-Area Networks (LANs and WANs)
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Networking Topologies
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Star
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Bus
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Ring
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Physical and logical topology
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Networking Hardware
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Hubs [Physical]
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Bridges and Switches [Data Link]
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Routers [Network]
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Addressing
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MAC Addresses [Data Link]
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Internet Addresses [Network]
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Port Numbers [Transport]