What memory component does a router check first during its boot process?

During the boot process of a router, the first memory component that is checked is ROM (Read-Only Memory). ROM contains the router’s bootstrap program, which is essential for the initial start-up process. This program initializes the hardware and then locates the operating system image, typically stored in flash memory, for loading into RAM (Random Access Memory).

At boot, after the bootstrap process in ROM completes, the router looks for a valid IOS (Internetwork Operating System) image in flash memory, which it then loads into RAM where it can execute programs. Additionally, NVRAM (Non-Volatile RAM) is accessed later in the process, specifically to read the startup configuration file, if available, which dictates how the router should operate.

In summary, ROM is crucial for initiating the boot sequence, making it the first memory component checked by a router during the boot process. This order ensures that the necessary instructions for loading the operating system and configuring the router are followed systematically.