What Is The First Action In The Boot Sequence When A Switch Is Powered On?
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What is the first action in the boot sequence when a switch is powered on?
After the switch is powered on, we load the power and self-test the program in the boot sequence. Now, let us know how this device gets works.
Firstly let us compare the boot-up process of the computer with the boot-up process of the router. Many of us may not know the boot-up process of the PC or at least the details of the Boot-up process, however, the boot-up process of the PC is very precise. since the router is essentially a PC, now we are going to find out the boot-up process is very similar. The Boot-up process must be known for several reasons.
There are features on the router that we need to take an advantage of especially when we need to perform the password recovery or it can be restoring a broken operating system.
We just need to know how to repair all this on the router and on the PC. But repairing the PC is a bit different, we have a lot of documentation, we do not need to know the order of our PC boots up.
On the both PC and in the router, the first process to perform is to POST. The post is nothing but the power-on.
It is a test that runs to make sure that all the components get work. suppose if one of the components fails, the post device won’t boot. We need to know that if the POST doesn’t pass devices, there is something wrong and we should get it fixed. after the POST runs on the PC, the next thing that loads is the Basic Input/Output System. we call it the BIOS.
The bios are the basic set of instructions in order to get the system running. Suppose we have a bunch of hardware in the system and in order to use the hardware, we need an operating system. But in order to get the operating system loaded on the hardware, we need an operating system to tell us where the hardware is present.
But to put the operating system on the hardware, we need an operating system to do that. Here the BIOS be the kickstart to the system. It loads a minimal set of instructions into the memory that can be used to call the operating system on the PC. Once the BIOS loads it finds the operating system and it does that looking through all the drives on the PC and the user gets to specify the order that your PC looks through the drives to find an operating system.
Suppose we can have bios set up so that the PC first boots from the USB drive than from a CD-ROM drive. If we have one installed, it boots from the hard drive and if the hard drive isn’t present, then it will try to boot a network boot. Inside of the BIOS, we specify the boot order and we can run the multiple operating systems from multiple different devices.