What is stored in ROM in a router?

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Multiple Choice

What is stored in ROM in a router?

Explanation:
The main idea is that ROM holds the tiny bootstrap code that starts the device and runs basic diagnostics. On power-up, the router executes this boot code, performs the necessary POST tests, and initializes the hardware. That bootstrap then loads a full IOS image from flash into RAM so the router can operate, because the bulk of the operating system runs in RAM, not in ROM. The startup configuration sits in NVRAM and is applied at boot, while the IP routing table lives in RAM and is built and updated as routes are learned. So ROM is specifically for bootup instructions and basic diagnostic software.

The main idea is that ROM holds the tiny bootstrap code that starts the device and runs basic diagnostics. On power-up, the router executes this boot code, performs the necessary POST tests, and initializes the hardware. That bootstrap then loads a full IOS image from flash into RAM so the router can operate, because the bulk of the operating system runs in RAM, not in ROM. The startup configuration sits in NVRAM and is applied at boot, while the IP routing table lives in RAM and is built and updated as routes are learned. So ROM is specifically for bootup instructions and basic diagnostic software.

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