NVRAM
NVRAM Stores startup-config. The IOS (Internetwork Operating System) is stored in the flash. Both flash and NVRAM are non volatile storages but there is a major difference.
In order to see the running configuration on a Cisco 2600 router, follow these steps from user executive mode.RouterName> EnableRouterName# show run
show version
The primary interface which would be used for initial configuration of a Cisco router exam is 200-120 In this exam you can get all router related details and also about the primary interface usage probelms and there solutions. To get this exam dump visit the link below... dumpspdf.com/200-120.html
The difference is that the write mem command is being discontinued. It is being replaced by the copy command and is the one you should use on the cisco tests. I still use this command on some routers such as 831, 871, 3002, 2950, 2600 however it appears that as of IOS 12 it will be gone. Hope this helps!
wr or copy running-config startup config
That's where the router's startup-config (startup configuration) is stored.That's where the router's startup-config (startup configuration) is stored.That's where the router's startup-config (startup configuration) is stored.That's where the router's startup-config (startup configuration) is stored.
NVRAM Stores startup-config. The IOS (Internetwork Operating System) is stored in the flash. Both flash and NVRAM are non volatile storages but there is a major difference.
To empty the startup configuration on a Cisco device, you can use the command erase startup-config in privileged EXEC mode. To remove the running configuration, you can use the command write erase followed by reload to restart the device, which will clear the running configuration and load the default settings. Remember to save any necessary configurations before performing these actions, as they will result in data loss.
cisco configuration command guide
The startup configuration will be erased and if the router is restarted will boot with no configuration.
The Cisco ISO is the "Operating System" of the Cisco device. The user can configure the device by accessing and changing the configuration in the ISO.
If you want to make the saved configuration the current configuration, essentially undoing configuration changes since you last saved, you can use:copy start runcopy startup-config running-config
The startup configuration file on a Cisco router contains the configuration settings that are loaded into the router's memory when it boots up. It specifies parameters such as interface settings, routing protocols, access control lists, and other operational settings required for the router to function properly. This file is stored in the router's non-volatile memory (NVRAM), ensuring that the configuration persists even when the router is powered off. Essentially, it serves as the baseline configuration that the router uses to establish its operational state.
The Security device manager is stored in the Router's Flash Memory
When a Cisco router is booted up for the first time, or is reloaded, the router will look into its Non-Volatile RAM (NVRAM) for the startup configuration file. Setup Mode is usedto configure a Cisco router or switch after start up to create a startup configuration file.
Page 11 of Routing Protocols and Concepts by Cisco. 1. POST 2. Loads Bootstrap program 3. Locates Cisco IOS 4. Loads Cisco IOS 5. Locates the configuration file 6. Load the startup configuration file or enters setup mode