For example, I'm going through a Cisco Live presentation on troubleshooting ASR routers, and the first 50 slides or so are completely dedicated to describing the Route Processors, Packet Engines, ASICs, Buffers, etc., and the different paths that packets can take through the hardware.
While that's all obviously important to the functionality of the router, how critical is it for the individual operating and maintaining the router to understand it all? I can see it being important if you're trying to squeeze every last bit of performance out of a device, but outside of that case, when does one need to think about the underlying architecture of a network device?
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