What is the use of AUX port on Routers. Please explain throughly ?

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What is the use of AUX port on Routers. Please explain throughly ??

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The purpose of the auxiliary port is for connecting to an external modem. Once configured, this modem can be used as a backup demand-dial connection to another location, or as a way to dial in to the router for troubleshooting purposes should regular connectivity fail.