Why? Because then your device would not be able to get it's operating system if it lost IP connectivity to the TFTP server. But there are mechanisms to load it from a or TFTP server. We prefer it to be in Flash on our chassis so you don't have to look elsewhere. And then step three would be hey, let's find the IOS, let's go ahead and find it and it could be in a few different places. It's the operating system before the operating system, if you will. So we load this bootstrap, and think of a bootstrap as just preparing for a real operating system. ROM is utilized first as we can see, perform our power-on self test, or POST, make sure the hardware is there, make sure they're functioning properly, load the microcode, the code that is necessary to find the various features we need, such as our IOS image and our configuration file. Well let's look at this boot sequence, not so we can memorize it, it's not why we're doing this, but so we understand what's happening here with our router.
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