Boot up the router
Just like a PC, a router boots up too. The power-on self test (POST) and bootstrap program also run on the router's boot process. Furthermore, hardware components such as CPU chips, RAM/DRAM, NVRAM, and Flash memory are initialized. Finally, the operating system IOS is located and loaded into the RAM/DRAM.That said, this section discusses the router's boot process.
Router's boot up process
Just like a switch, a router has a boot up process. It consists of several phases, and in each phase, significant activities are carried out. The following steps represent the router's boot process, when it is powered on:
- As electricity starts flowing into the router's internal circuitry (more precisely, into the ROM module), the POST performs a hardware check on the CPU, RAM, and the NVRAM. Once the POST is over, the bootstrap program is loaded from ROM to RAM.
- The bootstrap program initializes the CPU and Flash memory. It then locates the IOS in the Flash memory and copies it into the...
