Introduction to various command modes of Cisco Routers

Introduction of Cisco router command modes knowledge about Cisco router command modes is very helpful for network security management. network security management involves many aspects, but throughout many security events, we can draw a basic conclusion that the harm is caused by ignoring the basic security measures. This article will discuss the importance of maintaining the Cisco Router password security, explain the Cisco router command mode, and show readers how to configure five passwords to protect network security. Www.2cto.com first, as the administrator of Cisco equipment, we must realize that there is no automated password defense for routers. The Administrator must take the password settings of Cisco devices seriously. The soul of a Cisco device is IOS, which has different Cisco router modes. These Cisco router modes are set in different levels, which means that the deeper the access, the more privileges are required, and the more passwords are set for each corresponding layer. 1. User Mode router> in user mode, the basic interface information of the router is displayed. Some people think that this Cisco router mode is useless because configuration changes cannot be made in this mode, and users cannot view any important information. 2. Privileged mode router # administrators can view and change configurations in this mode. I believe that it is absolutely important to have a set of passwords at this level. To switch from user mode to privileged mode, the administrator needs to enter the enabel command. Www.2cto.com 3. Global configuration mode router (config) # In privileged mode, we can enter the config terminal command to enter global configuration mode. Here, we can make changes that affect the operation of the entire router. These changes include, of course, configuration changes. As an administrator, we need to go further to the vro command to make reasonable changes to its configuration. 4. Correctly configure the five passwords. First, you must know that Cisco's IOS has five passwords, namely, the console) password, AUX password, VTY password, Enable password, and Enable secret password. The following are analyzed respectively. 1) Console Password www.2cto.com if the user does not set a password on the vro console, other users can access the user mode, and if no password is set for other Cisco vro modes, others can easily enter other Cisco router modes. The Console port is the place where the user first sets the new router. It is extremely important to set a password on the Console port of the vro, because this prevents others from connecting to the vro and accessing the user mode. Because each vro has only one console port, you can use the line console 0 command in global configuration, and then use the login and password commands to complete the settings. Here, the password command is used to set an appropriate password, as shown in the following figure: 2) Enable password-enable password command can prevent someone from obtaining full access to the vro. The Enable command can be used to switch between different security levels of a vro (a total of 16 security levels, such as 0-15 ). However, it is most commonly used to switch from Cisco router mode (level 1) to privileged mode (Level 15 ). In fact, if you are in user mode and the user type the enable command, this command assumes that you are in privileged mode. If you want to set a password to control the user's switch from user mode to privileged mode, you need to enter global configuration mode and use the enable password command, as shown below: the bad side of the Enable password command is that it is easily guessed by others, which is why we need to use enabel secret. 3) Enable secret-enable encryption password is the same as Enable password. However, by using "enable secret", the password is stored in a more robust form of encryption: Router (config) # enable secret SecR3t! Enable, in many cases, many network paralysis is caused by lack of password security. Therefore, the Administrator must ensure that the vswitch and vro passwords are correctly set.