the next topic of discussion or the last topic of discussion is the router boot sequence,
and this is not going to take too long.
So when you power on a router, hit the start button,
the router performs a power on self test or post
to evaluate if all the hardware is functioning properly. So to verify all hardware function, to make sure all the interfaces are operational and so on and so forth.
Next, a program in Rome called the Bootstrap Program
goes out and looks for the operating system or the Internet working operating system or the IOS,
and loads it by default. I us is stored in flush.
Then the U. S has expanded into RAM or your random access memory and the startup config or the configuration file.
Sitting in envy. Ram
Sarah config in envy. Ram is loaded.
So next the router looks for any valid configuration that it might already have in startup and fig, which descend envy ram, And then then it loads that
the contribute or the configurations from the envy ram next is loaded into ram, which is your volatile memory as the running conflict.
Now, once you have your running conflict, then you're ready to work on your router.
However, if the stardom config is not present in step three,
then the router will start broadcasting out every up interface
and start looking for a tea FTP server basically looking to see if
some configuration file has been stored on a T FTP server.
If a T FTP server is not found,
then the router goes into the initial configuration dialogue that we saw at the very beginning of this class. That's bringing us a full circle.
So when nothing resides in envy, Ram and you can't find a T FTP server, you go to the initial configuration dialogue
boot sequence lecture.