ccna 200-301 pdf online

ccna 200-301 pdf online.Administrators can use the global configuration mode command no service password-recovery to mitigate this potential security risk. no42 Chapter 2 Protecting Network DevicesThe service passwordr-ecovery command is a hidden Cisco IOS command with no arguments or keywords. If the router is configured with the noservice password-recovery command, all access to ROMmon mode is disabled. After you enter the noservice password-recovery command. a warning message is displayed and must be acknowledged before this feature can be activated. Once configured, the showrunning configuration command displays the no service password-recovery statement. In addition, after the router boots, the initial boot sequence displays the message " PASSWORDRECOVERY FUNCTIONALITYIS DISABLED that is, the password recovery feature is disabled.After entering the no service password-recovery command, if the device still needs to be recovered, the device will prompt for confirmation of the interruption by executing the interruption sequence within 5 seconds after the image file is unpacked during the boot process. After confirmation, the boot configuration file is completely deleted, the password recovery process is initiated, and the router boots up with the factory default configuration. If the interrupt is not confirmed, the router will boot normally with the noservicepassword-recovery command.Warning: If the router's flash memory does not contain a valid IOS image file due to corruption or deletion, the xmodem command under ROMmon cannot be used to load a new flash image file. To repair the router, the administrator must reload a new CiscoIOS image file on the flash SIMM or PCMCIA card. For more information about backing up flash image files, refer to the cisco.corrio2.3.2 Security Management and Reporting2.3.2.1 Managing and monitoring network devicesNetwork administrators need to securely manage all devices and hosts on the network. In a small network, managing and monitoring a small number of network devices is fairly simple. However, in large enterprise networks that contain hundreds of devices, monitoring, managing, and handling login information becomes challenging.