Time
15 hours 34 minutes
Difficulty
Intermediate
CEU/CPE
16

Video Description

Router Boot Sequence In our final lesson on additional protocols, we examine the importance of the Router Boot Sequence and discuss why each individual step is important in its own right. For example, you'll learn why routers perform a power on self-test and why its IOS is expanded into RAM. We'll discuss the importance and function of TFTP Server, and what information a routers is looking for and where routers go to find it, what happened when it doesn't.

Video Transcription

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
01:57
that ends the
02:00
boot sequence lecture.

Cisco CCNA

Our free, online, self-paced CCNA training teaches students to install, configure, troubleshoot and operate LAN, WAN and dial access services for medium-sized networks. You'll also learn how to describe the operation of data networks.

Instructed By

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Junaid Memon
Instructor