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When a router boots up, it performs a series of steps, called the boot sequence, to test the hardware and load the necessary software.
1. The router performs a POST. The POST tests the hardware to verify that all components of the device are operational and present. For example, the POST checks for the different interfaces on the router. The POST is stored in and run from ROM (read-only memory).
2. The bootstrap looks for and loads the Cisco IOS software. The bootstrap is a program in ROM that is used to execute programs. The bootstrap program is responsible for finding where each IOS program is located and then loading the file. By default, the IOS software is loaded from flash memory in all Cisco routers.
3. The IOS software looks for a valid configuration file stored in NVRAM. This file is called startup-config and is only there if an administrator copies the running-config file into NVRAM.
4. If a startup-config file is in NVRAM. the router will load and run this file. The router is now operational. If a startup-config file is not in NVRAM, the router will start the setup-mode configuration upon bootup.
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If a router cannot find a valid configuration file during the startup sequence what will occur?
The router will prompt the user for a response to enter setup mode.
What is the purpose of NV RAM on a Cisco router?
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.
What is the consequence of issuing the erase startup-configcommand in privileged EXEC mode on a Cisco router?
The startup configuration will be erased and if the router is restarted will boot with no configuration.
What is the difference between a router's running configuration and startup?
The startup config is what has been saved to the memory (using write mem) and is used when the router is powered on. You can change the startup config after it has been powered up, this would be the running config. If you power the router off without saving the changes, it would revert to the startup config.
What is the router memory used to store the startup configuration?
NVRAM
What command is to show router boot up process?
startup config
What is the correct flow of routines for a router startup?
• load bootstrap, load IOS, apply configurationsource :http://learn-ccna.net/907-which-of-the-following-is-the-correct-flow-of-routines-for-a-router-startup-907-20091511.html
What is setup mode?
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.
What information about the router and its startup process can be gathered from the output of the show version command?
A
Which location of router memory is cleared with the erase startup-config command?
NVRAM
What command do you type to save the configuration stored in RAM to NV RAM?
Router(config)#Copy running-config startup-config
You want to replace the current running-config with the current startup-config and totally reinitialize the router . What command will you use?
You want to totally reinitialize the router and replace the current running-config with the current startup-config. What command will you use?
