The art of network architecture by Russ White and Denise Donohue

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• understand the business

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• networks change

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• VDI = Virtual Desktop Infrastructure

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• PIN = Place In the Network - dividing a network along functional rather than topological links

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• TRILL = Transparent Interconnection of Lots of Links

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• If we treat the control plane as a distributed database, then the network is converged when every router (or device with a copy of the database) has the same view of the network's state, or a consistent set of best paths through the network.
• Stretch, quite simply, is the difference between the optimum path through the network (for any pair of hosts) and the actual path through the network.
• anytime you hide state, you increase stretch

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• virtualization - creation of virtual topologies (or information subdomains) on top of a physical topology