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

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• event driven notification vs polling driven notification
• frr = fast reroute - precomputing the backup path

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• close a door, open a door - there's always a trade-off

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• FCAPS = fault, configuration, accounting, performance, security

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• learn graph theory and geometry

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• anytime one packet is encapsulated inside another packet of the same or a higher layer, the packet is being tunneled

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• how fast does the routing protocol converge, is it proprietary, easiest to conf and tshoot, best for the specific topology

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• there's no such thing as free lunch

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• lisp = Locator Identifier Separation Protocol

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• if the service is free, you are the product

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• sdn - a network where there is an application programming interface (API) into the network that allows applications to both understand and react to the state of the network in near real time

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• minimize oversubscription in data center networks