What information does the show startup-config command display?

The command "show startup-config" is used to display the saved configuration file stored in non-volatile RAM (NVRAM) on a network device, such as a router or switch. This file contains the last saved settings and parameters that the device uses to initialize its operations upon reboot. The startup configuration includes crucial information, such as interface settings, routing protocols, and any access control lists that have been configured on the device.

When the device is powered on or restarted, it references the startup configuration from NVRAM to establish its operating configuration, which is why it's vital for network administrators to ensure that this file reflects accurate and desired settings. It is different from the running configuration, which represents the current operational settings of the device, held in RAM and can change with commands issued interactively.

By understanding the purpose of the "show startup-config" command, you can effectively manage and troubleshoot device configurations.