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ccna udemy reddit.Note equipment and cables. It is beyond the scope of this book to discuss these issues in depth; Cisco's CCNA Security and CCNP Security courses discuss them in more depth.10.5.2 PasswordsThe most common way to restrict access to IOS devices is to take user authentication; for example, passwords can be configured to restrict access to user EXEC mode (lines that access IOS devices) and privileged EXEC mode. Passwords are configured in the same way on CatalystIOS switches (such as 2950 and 2960 switches) and IOS routers. The next few subsections discuss how to configure passwords on IOS devices.1. User EXEC Password ProtectionTo restrict access to the user EXEC mode on an I0S device, you need to configure each line separately: console line, auxiliary line, TTY, and VTY. as mentioned earlier, not all devices have auxiliary ports, only routers support TTY, and the number of supported VTYs varies by product: from 5 (0 ~ 4) to thousands.To protect the console port, you must first use the command line console0 to enter the line sub-configuration mode of the console port in order to configure the line password.IOS(config)# lineconsole 0 IOS(config-line)# password console_passwordThe 0 in the first command specifies the console port. Lines and interfaces are numbered starting with 0, although the I0S device has only one console port, which is also assigned the number 0 (as is the case with most Cisco products). Next, notice the change in the prompt on the second line. Once you enter line sub-configuration mode, you can use the command password to set the console password. On IOS devices, the password is case-sensitive. Don't forget that the command password, when executed after the command line console0, sets the user EXEC password, which restricts access to the IOS device only through the console port.The auxiliary port is typically used as an alternate console port or as a remote access port to a modem. The following code demonstrates the syntax for configuring password authentication on a secondary port.Router(config)# lineaux 0 Router(config-line)# password console_password Router(config-line)# exit