Auxiliary Port on a Cisco router

By | June 8, 2020

Most Cisco routers include an additional auxiliary (Aux) port as a backup async port. This port is commonly used as a dial-up port for remote router management. It is connected to a modem and enables an administrator to make a phone call to connect to the router’s CLI.

The following figure shows how to connect a modem to an aux port on a router (image source: Cisco):

Cisco router auxiliary port

The network administrator uses a terminal emulation program to connect to the router over the aux port. The configuration of the aux port resembles the the console port configuration:

Router(config)#line aux 0
Router(config-line)#password cisco
Router(config-line)#login

The code above enables password checking for users dialing into the router.

Prerequisites for 200-301

200-301 is a single exam, consisting of about 120 questions. It covers a wide range of topics, such as routing and switching, security, wireless networking, and even some programming concepts. As with other Cisco certifications, you can take it at any of the Pearson VUE certification centers.

The recommended training program that can be taken at a Cisco academy is called Implementing and Administering Cisco Solutions (CCNA). The successful completion of a training course will get you a training badge.

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