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Have a think about where it might be useful for additional networks to be in place. A good and common example is for backup networks, where companies will set up a dedicated network that's specifically for backup traffic.
Backups range in size, but can easily be gigabytes and even terabytes sometimes, so it makes sense to give them an entirely independent network of their own.
You can also manage traffic priority with things such as Quality of Service ( QoS) settings on larger and enterprise networks. This can be a valid solution if you would rather deal with the software administration overhead of dealing with such scenarios. Generally, I'm a fan of simple, and though it definitely costs more to have physical equipment, it's less to manage in the long run.