ccna 200-301 pdf book

ccna 200-301 pdf book.If an attacker gets into the router, then they can do many things. For example, they can modify traffic, modify the configuration, and evencan erase the boot configuration file and the CiscoIOS image file. If the configuration file or the Cisco IOS image file is erased, the administrator has toretrieve the archived copy to recover the router. The recovery process has to be performed on each damaged router, which increases network downtime.If someone formats the router's memory or erases the configuration file in NVRAM, the Cisco IOS resilient configuration feature allows forfast recovery. This . feature enables the router to resist malicious attempts to erase configuration files by protecting the router's image file and maintaining a secure working copy of the running configuration file.resist malicious attacks that attempt to erase configuration files.When a CiscoIOS image file is protected, the resilient configuration feature rejects all requests for copying, modification, and deletion. Boot ConfigurationA secure copy of the file is stored in flash memory along with the secure I0S image file. The CiscoIOS image file and the router's operational configuration file are calledas the boot set (bootset). oThe CiscoIOS resilient configuration feature is available only for systems that support the PCMCIAAdvancedTechnologyAttachment (ATA) flash memory interface.