00:04
the next topic of discussion or the last topic of discussion is the router boot sequence,
00:09
and this is not going to take too long.
00:12
So when you power on a router, hit the start button,
00:15
the router performs a power on self test or post
00:20
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.
00:30
Next, a program in Rome called the Bootstrap Program
00:35
goes out and looks for the operating system or the Internet working operating system or the IOS,
00:42
and loads it by default. I us is stored in flush.
00:46
Then the U. S has expanded into RAM or your random access memory and the startup config or the configuration file.
00:55
Sitting in envy. Ram
00:57
Sarah config in envy. Ram is loaded.
01:00
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
01:10
the contribute or the configurations from the envy ram next is loaded into ram, which is your volatile memory as the running conflict.
01:19
Now, once you have your running conflict, then you're ready to work on your router.
01:23
However, if the stardom config is not present in step three,
01:27
then the router will start broadcasting out every up interface
01:32
and start looking for a tea FTP server basically looking to see if
01:37
some configuration file has been stored on a T FTP server.
01:41
If a T FTP server is not found,
01:44
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.
01:51
So when nothing resides in envy, Ram and you can't find a T FTP server, you go to the initial configuration dialogue
02:00
boot sequence lecture.
