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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.