You don't need a separate Internet for management. For good practice, the ideal is to have a distinct VLAN for Management to isolate traffic, but a dedicated internet link is not necessary for this. As for whether most configurations are like this, I can say that it is relative, it depends on the size of the customer's network and the maturity of the network. In projects where the client understands this, it is easier to implement, while in others they generally prefer to make the network as simple as possible.
... View more