• Password configuration is an in-built feature of Cisco devices.
  • Each Cisco device uses a password to authenticate users for accessing the device and also provides security to the Cisco devices.

There are five types of the password which are used to secure Cisco routers:

  • Enable Password
  • Enable Secret
  • Auxiliary Password
  • Console Password
  • Telnet Password

Enable Password

Enable password allows security on a Cisco router when a user moves from User Exec Mode to Privileged Exec Mode.

You can set enable password in global configuration mode by using the command“enable password”:

configure-password

The above command creates the enable password.

  • In case, if you entered an incorrect password three times, it will show the error “% Bad secrets.”
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  • If you entered the correct password, it directly enters in the Privileged Exec Mode.
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  • If you forget the password, use “show running-config” command to view the password.
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Enable Secret Password

Enable secret password is quite similar to the Enable password. The main difference between Enable and Enable secret is the encryption. Enable password stored in a plain text format and is not encrypted. While in Enable secret password, a password is in encrypted form. Means Enable Secret Password is more secure as compare to Enable password.

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To see your encrypted password, use “show running-config” command.

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Auxiliary Password

Auxiliary Password is configured into the “Global Configuration Mode” by typing the command “line aux ?”

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You can see <0-0> because there is only one port.

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Console Password

Console password is used on a network when multiple users have to access the router. It prevents an unauthorized user from accessing the router.

To set the console password, use “line console 0” command. We choose 0 because there is only one console port.

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Telnet Password

To configure Telnet password into the router or switch, first, move into the line configuration mode and use line vty0 4 command. Here ‘0 4’ means we are configuring the router for 0 to 4, i.e., total of 5 users can take router’s telnet at the same time.

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There are three sub-portions of telnet which should be configured on to the router before you can access it through-

  1. An interface IP
  2. Enable or Enable secret
  3. Vtyconfig

Let’s verify to take telnet of a router

Our topology is:

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First assign the IP address to router, PC, and server so that they can communicate with each other.

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To verify the reachability to the router, we use ping command as below example:

Since we are able to ping, now try to take telnet to router from ping.

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Important Note:

Note 1: To provide the IP address to the device (PC or Server), first click on the device then click on IP configuration and provide IP address manually to the device.

Note 2: For ping, click on the device then go to command prompt and first type ping and then the IP address of the device that you want to access.

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