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The first step the Rada performs a power on self test or post then it loads and runs the bootstrap code.

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Thirdly it finds the Cisco Iowa software.

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So the bootstrap code determines where the Cisco Iowas software is.

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That should be run.

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Normally this is located in flash memory but it could also be stored on a TFT server configuration register

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and the configuration file determine with Cisco Iowas falls are located and which image file to use

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if a Cisco Iowa image cannot be located a scaled down version of the Cisco Ioway is copied from Rome

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into RAM.

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That only applies however to older versions of Cisco routers in the past.

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A mini operating system would be used but today the road will boot into run monitor mode.

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If no Cisco is available after the bootstrap code is found the correct image it loads the image into

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RAM and starts the sky with software.

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Older rod is used to run the operating system from flash and memory.

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But today once again the entire operating system is loaded into RAM.

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Once the operating system is loaded the Radu will find the configuration which is typically stored in

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nv ram so to load the startup config from nv ram and then apply it the startup config is loaded in RAM

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and becomes the current all running config on the router.

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The running configuration of Varada contains the IP addresses it determines which running protocols

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need to be started.

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Which passwords need to be configured and other characteristics of the router.

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If no configuration file exists or the router enters the Setup Utility what Timpson.

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Or to install of a configuration file from a TFT server.

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The router then runs the configured Iowa software that's important to remember that Cisco Karaite the

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Iowa software.

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You can't change that but you can change how it's applied by changing the configuration on a router

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in the same way as with Windows.

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You can change the Windows operating system but you could change your desktop.

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You could change the phones and other options in Windows.

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The Cisco Iowa software can be manipulated through the configuration so you may decide to run the OSPF

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routing protocol on one router but use the GOP on another router.

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Your configuration determines the behavior of the Cisco Iowas on a router on those Fratta as an example.

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They wrote it does have a startup config so show startup config shows us the configuration of this router

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on this router.

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We could raise the startup config

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so now the shows start up c'mon show startup config.

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C'mon shows us that there's no rodder configuration.

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If we reload this router it will boot with no configuration and we should be prompted to enter the startup

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wizard on this Shradha which does have a startup config.

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So once again show start when we reload the router it should boot with the startup configuration applied

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as the running config so shrouded doesn't have a startup config.

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Whereas this router on the left does have a startup config so we should see the difference when they

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boot up.

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We can see the Rania's tryna get a configuration from a server.

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So it's trying to boot and retrieve a configuration so it's sending a broadcast looking for a network

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config this route is continuing to boot up

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and notice a configuration has been applied.

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The Rodda has a name.

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And if we scroll up

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we can see that various interfaces came up.

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But in this case sure run shows us that a configuration has been applied.

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So the configuration was copied from start up to running.

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Ways and this Rodda the system configuration.

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Dialog starts up and I pressed enter a few times and hence it was shown a few times and then I broke

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out of the initial configuration dialog and noticed in this case shows start shows us that there's no

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startup config and the router has a default configuration applied.

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Now it did configure an IP address automatically on the serial interface using what's called slop.

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That's why we were seeing this era where it was trying to connect to a TV B server and download a network

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config as well as a Cisco net config file.

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On some routers when there's a serial interface the router will automatically apply an IP address based

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on the neighboring router to this interface and try and pull a config down from that neighboring router.

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This router however has a configuration so we can see OSPF has been enabled.

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There's a loopback IP address there's an IP address on the serial interface and any other configuration

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would have been applied with this Rodda that doesn't have a startup config boots up.

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No startup config is applied and it uses a default config and may do some automatic configuration or

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use automated methods to try and find a configuration.

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The moral of the story is as follows.

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If there's no sort of config the router will typically boot up with some default values.

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Such as having most interfaces shut down ways if a startup config is available in the router that startup

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config will be applied.