During The Boot Process, Where Will The Router Bootstrap Program Look For The Ios Image By Default?

During the boot process, where will the router bootstrap program look for the ios image by default?
During the boot process, the router bootstrap program first looks into the flash memory. If the IOS image is not found in the flash memory then we look into the TFTP server. Now, let us learn the boot process of the cisco router. Let us learn the step-by-step process of the boot process. When we power on the router, it will perform the POST. POST stands for power-on self-test. The power-on self-test will test the hardware of the router like ROM, RAM VRAM, and so on.

If the hardware test gets passed then it will check the bootstrap configuration of the value. The bootstrap checks the comparison register value to specify where the ios are get loaded. After the boot is get trapped, it is to locate the IOS. It searches the IOS in the flash, if we do not find it in the flash, then it will search in the TFTP server.

If it is found in flash or in TFTP then it will get exacted and load the ios in the ram. After we load the IOS into the random access memory, it will locate into a startup configuration from the NVRAM or the TFTP server or from the console. If we locate or find the startup configuration then we load the startup configuration. If we do not find any start-up configuration then we go into the setup mode. In the initial configuration, we have to perform the manual configuration.

Let us learn the different stages of the booting sequence in detail and its stages. Inside the router, we see many of the components like ROM, flash, NVRAM, and ram. Let us learn about the different components of the router.
ROM is one of the components in the router. The ROM can store four components in it. They are POST, BOOTSTRAP program, ram on mode, and in the mini ios. These are the different individual components of the RAM.
FLASH is another type of component that we have discussed. the flash is a permanent memory that means the data that is stored in flash is not lost even when we turn off the router. The router or switch uses the flash to store the ios image.

Another component is the NVRAM, which is a nonvolatile random access memory. It is also called the permanent memory

RAM is another component, it is a type of temporary memory, we lose the data after the router is turned off. The RAM works as the fastest memory among all the other components of the router.

The configuration file is another type that contains two sets of configuration files. One is the running configuration and the other one is known as the start-up configuration. The configuration value and the configuration file are different from the other.

The Flash is used in most routers because we do not lose the memory even it gets turned off. We can say that flash acts as the hard disk of the router.