One of the most time-tested (though somewhat paradoxical) rules for network design is this: Switch where you can, route where you must.
When network designs follow these patterns, it’s easy to find a diverse mix of good products and, using those products, build reliable and economical networks. While every network is different and has to be crafted to the needs and scale of the enterprise, some helpful patterns have emerged that both network managers and network equipment manufacturers follow. At their heart of the network lie the workhorses - the often underappreciated switches and routers that connect users to data centers. Networks empower people to do their jobs, to communicate and collaborate, to teach and learn.
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