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I used to manage a Full Tolerance Infrastructure.
2 Devices of Everything (Routers, Firewalls, Edge Switches, Core Switches, Access Switches, etc) 2 Internet Providers 2 Private Circuits
Network Documentation is very very important, for Network Admins is a must, because for example a new team member joins, this information will be useful to acknowledge the network infrastructure.
I have experienced that T3 (DS3) collapses (saturates) once you reach 40 Mbps, even rate is up to 44 Mbps.
