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Cisco Systems Engineering Interview Question

I interviewed in Milpitas, CA and was asked:
"(Gave a little high-level model of packet-forwarding and shot this question - ) What design changes would you suggest to improve the routing-speed? (After I gave out an answer - ) What else are the alternative ways (Good or Bad) of achieving this? Give the major pros and cons or those approaches."
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Part of a Engineering Interview Review - one of 1,063 Cisco Systems Interview Reviews

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(from high level) - Re-adjusting the bits used for secondary purposes eased up the bit-congestions and related bottlenecks. The dark side is the decreased redundancy and consistency checks etc.
- Interview Candidate on Jan 4, 2010

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