You can log in to a device through a console port or using Telnet or SSH (STelnet) to maintain the device locally or remotely.
If multiple users log in to a device through a console port, the following security risks occur:
- The device authenticates only the first user.
- The input information of a user is displayed for all users at the same time. For example, if a user runs a command to change the password, the input information is visible to all users at the same time.
Therefore, logging in to a device through the console port is not recommended. If this login mode is required, do not configure multiple users for simultaneous login.