ccna udistrital

ccna udistrital.To set a Telnet password for the VTY, use the following configuration.IOS(config)# linevty 0 15 IOS(config-line)# password telnet_password IOS(config-line)# loginIn this command, the parameter vty refers to the virtual terminal - an alias for Telnet or SSH access.2950 and 2960 switches can support up to 16 VTY sessions simultaneously and track each connection internally using a number (0 ~ 15). The number of VTY lines supported by the router ranges from 5 (0-4) to nearly 1000 depending on the router model and the version of IOS software used. You can configure a different password for each VTY, but by the time you Telnet to the IOS device, you may not even know which password to use. ios allows you to simplify the configuration by specifying all 16 VTYs in the command line as in the previous configuration: line vty 0 15o The starting VTY number and the ending VTY number must be specified on the same line.Once you are in line sub-configuration mode, you can use the command password to set the password. The command login is also required to allow remote access to the IOS-to allow the IOS to use the password configured with the command password on the specified line.Only the first 5 VTYs (0 to 4) are enabled by default. On devices that support more VTYs, you must enable them manually.When you log in to an IOS device remotely using Telnet, if you see the message Password required but none set, you have not yet configured a password for the line using the command password; until you do, you will not be able to log in. Don't forget to always use a password and login to protect the VTY; another method is to use an access control list (ACL), which is discussed in Chapter 21."-When configuring a VTY, if only one number is specified, as in the following, only that VTY will be configured.IOS(config)# linevty 0 IOS(config-line)# password ciscol23 IOS(config-line)# loginIn this example, only the password for VTY line 0 is specified, and the password for that line will be used when logging in. If only that VTY is configured on the IOS device, only one person will be able to access the device using Telnet or SSH (via VTY 0).Exam Point Be sure to familiarize yourself with this example, especially when doing this configuration on a freshly shipped IOS device.