Remote CLI Access
Another, older, version of out-of-band management is a configuration where there is a separate network available which allows network administrators to get access to console ports of network equipment, even when these devices don't forward any traffic at that moment. If a location has several network devices, a terminal server will give access to different console ports for direct CLI access, and if there is only one device it is for some switches possible to connect a dial-in modem to an AUX port. The mentioned terminal-server can often be accessed via a separate WAN that doesn't use the managed switches and routers to connect to the central site and/or it has a modem connected via dial-in access via POTS or ISDN.
Read more about this topic: Out-of-band Management
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