Big traffic and connecting by multiple patchcords?

Did connecting switch with computers to router by a few ethernet cables has sense? I would like to ensure 1gb connection speed on each part of my big network (about 50pcs, one nas).
I am planning to conenct NAS by 4 cables, NAS has 4 ethernet interfaces, so I have to configure 4 ips. But I dont know how to do it with switches.

You don't have to configure 4 IPs in a scenario like that. Just configure an etherchannel between these devices. You should find that in the NAS-documentation under "channeling", "LACP" or "802.3ad".
Don't stop after you've improved your network! Improve the world by lending money to the working poor:
http://www.kiva.org/invitedby/karsteni

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